Malicious PDF — malware analysis report

Static analysis result for SHA-256 649ea95d5761bb62…

MALICIOUS

PDF

86.9 KB Created: 2021-08-16 12:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4465bf156382b33c60f01392347775ca SHA-1: b18f01f4f24e72774c3b0bf5fa60dac768a74718 SHA-256: 649ea95d5761bb6259e6e937256e4dfdb29a453e09660af53aa7567715f2c9a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination. ClamAV and an ML classifier flagged this PDF as malicious, specifically identifying it as a phishing or trojan delivery mechanism. The presence of a link farm on potentially compromised infrastructure strongly suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. 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 http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078289042832---ruxogiwurilorivowe.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c104323ad2---dagedetiganomojuzupib.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/35745748526.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/11076282271.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/rojozagikejopawo.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/25604417513.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/fanudut.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/18643417993.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/xukopazivoneg.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/30667688281.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/68c6fb3ebe0ba8cee9c2df949af60f99/80322849468.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/an472dofscqgd129km9d0nqloj/jawufijipom.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/totirinateluratigez.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a9cb9cc03---xurajepowisojudotumiwa.pdfIn PDF document text
    • http://german-ex.com/konuwufurigoxo.pdfIn PDF document text
    • https://dcimx.com/files/47586885170.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/varevarojowikugoxezoja.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gugoxetujemineruwo.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/xaragil.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/5723b533c79c592e65184bf5055ff94a/83348930904.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/4gb3bbbihlgnds950rieq938r6/72367321758.pdfIn PDF document text
    • https://kueapem.com/contents//files/besezivanuwudademe.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/16d78e160ad8a12c0908addfc1543c4f/bukobizevenaropewezofiz.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/55553340875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+reset+a+bosch+silence+plus+50+dba+dishwasherPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 16928 bytes
SHA-256: 0b9841d49bb6afa29a20c1d8d9cbcf6367f2832f65020fc569ea164c809fc339
font_01_sfnt_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 11300 bytes
SHA-256: 7dddd5a1f68fad2ece97f9e5f86b250c6e476d31b9b50631ef2f2258def07b60
font_02_sfnt_off0001347a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1