Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8d16a31e289652…

MALICIOUS

PDF

74.7 KB Created: 2021-09-23 06:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 951f3cc0434b350a6e89e41e0e506718 SHA-1: caa950673f762386489fd65c014f0dac0bde589c SHA-256: bc8d16a31e2896524dd502ed0a97a6a1d994071c0f6e317311e235ae67a2d550
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://neoneofitou.com/ckfinder/userfiles/files/xugalitamise.pdf In PDF document text
    • http://zoldjogsi.hu/uploads/files/peniline.pdfIn PDF document text
    • http://protok.pro/upload/files/38108460601.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/mepeponoro.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7c8521d8---javuxaxasudeguranuzopilu.pdfIn PDF document text
    • http://kme-kme.cz/files/file/javekevetejabogawiz.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/dobogujisejifadore.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/59198483030.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/bevavijomigugakerob.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/kubapidegomaso.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/lovajodujebategojizab.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/63936368361.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/19794741144.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/67330248525.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/gebebezevifuwifegiwebode.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/degojakebemasuxonexoruvi.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/bexulaxoxopiduwupe.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1632074127.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/cb2d5a2383da64653a84a76639a1bd20/41519099171.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/65065936280.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/88cbe415f8c0f2ea4e441eb961dd0b1f/97025475967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=101+dalmatian+street+puppy+dreamsPDF 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_off0000bed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED7 17544 bytes
SHA-256: 580efd9159f09eb01532f66d185e917242e59d874103871df676073e79170c36
font_01_sfnt_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 10724 bytes
SHA-256: ba1b501a4c57f1830e23f08b59a65bbe115606877899c629fc238c89ad33a9a7
font_02_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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