Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f421396b862025…

MALICIOUS

PDF

90.5 KB Created: 2021-07-22 03:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c8e2977d1d4802b5a2c9adf5a9d9107 SHA-1: 4c6c65477751c23ff7e72ab84f1565c5f5b782f0 SHA-256: e7f421396b8620257ee099b635c4e641e58a8438ea04675c805dba389ae5be5e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to malicious content or phishing sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the final destination or leverage compromised infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://epoxidice.ro/mm/file/52606807307.pdf In PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/52475167851.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd5f4fb27---28911571326.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/1ca7810bb84854c81518041f854bc154/wedalaki.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7972272b---12411525370.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/43692767101.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607712e146f7e---talopen.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/ragajusogexelug.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/zakamumu.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/37169457890.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3d7cb265ea185986c12330da5057020a/28777493291.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/d3702484df5b26f4cae327b0c4c86a8a/moronakinikepoxaxole.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7aa004208---67012325066.pdfIn PDF document text
    • https://austarpharma.com/upload/files/ravonoresotisu.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/53945487995.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///49438780430.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/relenurave.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/570530781df123b1bbff6f0698683d2d/95738040841.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdae57e159b---fiwapabelijusoruzibap.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/42522408506.pdfIn PDF document text
    • http://ubest.ru/images/file/70834687808.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/lazupogowoni.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/qs9tjdvi9p687g354ejdvu6ee1/11871299106.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/83683609513.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf67f74407---xuwunotiguliravene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=class+9+history+chapter+5+question+answerPDF 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_off0000fabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABF 16864 bytes
SHA-256: 2157fc49dd639d38de99d9512391390a187645a6c122d2ca3a79d3cf710d004d
font_01_sfnt_off000126b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECE 11248 bytes
SHA-256: 80e8e92a3f681cc2702f20b5325548533849eb2cb2fcb6fe64180c07a4a1ade1

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