Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cd3cfc623d63a3…

MALICIOUS

PDF

224.8 KB Created: 2021-06-26 08:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ede20c1d8606c58785cc47c7761cfe58 SHA-1: d3edd1869a9bc823014f9f7d3280d625c4d65551 SHA-256: 35cd3cfc623d63a30d769d595c02aab53bdd89692c24b19d118ed35b31cc79df
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised WordPress upload storage, suggesting it is part of a phishing campaign to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing malware or phishing content. No scripts were extracted, but the embedded URLs and heuristic firings point to a phishing lure disguised as a free encyclopedia download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9571

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/gvpdpdbvi26vod3svrcap80nvl/nibedu.pdf In PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/37418035482.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ab5a44bf06c67922f6bb9d8b3460b1d9/degegatobadozelekufafad.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a837e2ce8eb---89747185054.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/5241a3839cebc565518a35af33b3c61b/muvubesobe.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828f89156fb---22665610264.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/20002092218.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/fijuwupija.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/86826587873.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31817af7a---42804004171.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e4f1e8880c46abe507335dd609c22151/304128558.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33155f223---puwubixon.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa18040375---15722942603.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160707a502b3f9---lijavogilaxixawanemuzidi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cdc4ce619---xularubisavaku.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8facb19c27cdf26722c2ece17659ece6/baguvuwofuzapuzowe.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160701153449b1---bejutewuzubasemisele.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/51450265797.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3a6bc8d8---vukufenorovereb.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/33208078340.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b082c409ba7---xobivaloditataw.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/gobupixosawanuku.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/371ddac1fef2e608d6a623714e2037e7/sapagewadotusazodobamov.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/4ef88379e78cda0dbaf7d4bc8a13216c/23158553268.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b803819f093---fadofiga.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/derumubod.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/kusapaborozafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=focal+encyclopedia+of+photography+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F680 10824 bytes
SHA-256: 5f2d74278de3e74a54415b91b68f276f2a1f8b74df7e5dcf7e412971588947a8
font_01_sfnt_off00030f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F29 16152 bytes
SHA-256: a639ee04e670fa10e9441d0b6b87793e79feed5339287adc9c519f4c531c2792
font_02_sfnt_off000324b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324B5 21912 bytes
SHA-256: a9f854fde4a18b2c092fe580bfd67281427e49349a7ef1742f609b2023174cd6
font_03_sfnt_off00035c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35C37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1