Malicious PDF — malware analysis report

Static analysis result for SHA-256 76661c12b4430987…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 21:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48e44e01a072b54171750e470e987d0a SHA-1: 87d7e9a382e8dfc5cbf62c7d19bd84d5a5f7c1ee SHA-256: 76661c12b4430987b77feca2e91b2172d46972cf8880a0083ca7f17ed44fc9aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://partnercable.com/files/84732011036.pdf In PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/buxami.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed92f37a1d---11842104955.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/59044948167.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/26780830760.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7ff1e14d4f19e50eb3156887ba4d1b51/xuwogarukesutifotu.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/93880755326.pdfIn PDF document text
    • https://petribax.com/userfiles/file/33309037942.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/gajezogu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613030f07edf7---89978351892.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161408d12457ee---54079815842.pdfIn PDF document text
    • http://korytnica.net/data/files/2124697332.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/lexoromije.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/3775134262.pdfIn PDF document text
    • https://zzwgjx.com/d/files/36212888016.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/wumisexagazi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19033da1b4113a999b6c146d9f69897a/80289853514.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/lusigovikufomutew.pdfIn PDF document text
    • https://matrixx.lu/images/wusoxebinewaxo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae57b7a62---tekidukakoloxikidafonozun.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f222d1d0509ab66e5b4c4d6364f66f1f/taxaviwerupisaranijes.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/97489370525.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ec46888f5---danalamuzunitorurumeze.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/16963782336.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132723584b37---99226625679.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/jujegogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ookami+shoujo+to+kuro+ouji+manga+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 16460 bytes
SHA-256: a25b953ce484856974f927e5dc91f51e687ee5f78b84001cdd7a75f3687c6052
font_02_sfnt_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 11112 bytes
SHA-256: 2f27a7d061fe7c93c46a53431c31d4e95b1fc43ba3fe0d34dea5805fdb3cbee4

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