Malicious PDF — malware analysis report

Static analysis result for SHA-256 878caadbad754f54…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 05:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af4d99c7153776dc2b2cc185c1f91ac8 SHA-1: 439df691d3f9e2c8600cdb23cbb3d47bc307b0ec SHA-256: 878caadbad754f54aad144d9f8d7da8d0647530ae7a428b2851709cb9d7f612e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, 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. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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 https://infrive.ru/uplcv?utm_term=red+riding+hood+2001 PDF link annotation
    • http://marcelponjee.nl/ponjeefiles/file/zabefunutilizarobuwago.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/gijupuxir.pdfIn PDF document text
    • http://modero.vn/upload/files/82270383477.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/74795313359.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/15340777502.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a85aafb2661---64562155918.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/lonasanaxeninonepix.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079b131854c0---bugowitororumazo.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/97801244036.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/53904890568.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/zituze.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/megapelevurubimigajigep.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985cc4c187a---90076560034.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/jutexarejesotudova.pdfIn PDF document text
    • https://anup.bo/images/files/29644472944.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/55263529113.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/17038335689.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f1985db52ca---jejogatu.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/31023183875.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/6560c35396f045163bc399253c02c55b/wimipijenowatoropeti.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/vadevopeg.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/zedovemimowufuwufewobize.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281102391965.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///45862517680.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd36175771---35942876091.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa36c477bea2d48a2efb104f16dcd270/58477957409.pdfIn PDF document text
    • 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_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 10392 bytes
SHA-256: 675cddf246b2da51a9731f5504c0aa2c7fde386b717dac3a9a3993e90c50fc7b
font_01_sfnt_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 19016 bytes
SHA-256: 90cd5f8958659870312471a797fe835b2e0123029c5bb269a495423ae6e4bd6f
font_02_sfnt_off00013544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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