Malicious PDF — malware analysis report

Static analysis result for SHA-256 786c932aeec889e7…

MALICIOUS

PDF

88.9 KB Created: 2021-09-13 02:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8fd02b7fd969f95245c5f28ff86047ca SHA-1: 660fb0f521afddda21771d4355404f4501097566 SHA-256: 786c932aeec889e73fc184d8c47b384680be6c82fb20c8db24288ab24c878808
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to various domains, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pixomot.ru/uplcv?utm_term=watch+free+online+hollywood+movies+on+mobile PDF link annotation
    • http://asirakademi.com/resimler/files/tutasogijifidazovoliga.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/supapon.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/75494958273.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/66910084300.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/liwofiz.pdfIn PDF document text
    • http://vititanon.com/user_img/files/lefedetovafexizo.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/lebutis.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/lusobonuwumo.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/95756760805.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b11f02dfab---nugorivuxid.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/95389428206.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b7b67b0a797ed1472075c198b8ae60e2/mazotifuwusikixofen.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cb1c45676a29c9184fac45c91eeb9e76/jezomokurubukujiz.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/68984259537.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/zepewuviwede.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6d2aa76ebf8801161bdfd1a4a9061dbc/jujegitegipawok.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/5337197056.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/49247772883.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/busurusipapagugijam.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210909_023150.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_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 17628 bytes
SHA-256: 42101d00c42e7dbd08c09ee9974998a95083105afd2fd9b4c392c1cbabe6ad67
font_02_sfnt_off00013c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2B 11140 bytes
SHA-256: f51c7072011c58ae44fdfda8f83ae91919d3fed196a43de251ec130a4fb4a373