Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd938e6fd0a9de0…

MALICIOUS

PDF

88.2 KB Created: 2021-09-19 19:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 477a8fde9a5ae36c08f4262c4e737d98 SHA-1: 7bffe21a404c3ec3728d35e356c092e204399174 SHA-256: acd938e6fd0a9de08774f716dcbd1cc04dcca06d031fed32e47a8fc54a02c19a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some links point to compromised CMS uploads or disposable hosting, suggesting a malicious intent to distribute further payloads or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=eragon+inheritance+pdf PDF link annotation
    • http://mathcountsoutreach.org/userfiles/file/72573871554.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/jirin.pdfIn PDF document text
    • http://keacg.com/upload/files/25904331892.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/rekanaxuvanewibif.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/23693324364.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/95397101758.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324a37d19fa---58317437594.pdfIn PDF document text
    • https://mavibusiness.it/file/74333181822.pdfIn PDF document text
    • http://asfalon.com/__files/file/verosujemimemuwubat.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/numamawirobidodelinelap.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/896855972.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/22622058199.pdfIn PDF document text
    • https://kiptep.ru/file/89687284697.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109081253406651.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/60756602607.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/25325429671.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/peganezokuzuruzutoda.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f77d2d7c---jifepuzibufel.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b4cea821bb3b431848f6d938e88d2108/topefajadivitobejinezaro.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/zekogugunakawatamoxab.pdfIn PDF document text
    • http://sns.hu/_user/file/80055790241.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/tuduvonu.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/pixusamu.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/xedoleritokatasib.pdfIn PDF document text
    • http://thepducphat.com/upload/files/nutipinitofulivonejinijaw.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_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 10668 bytes
SHA-256: d41668b365926e711009e308ef1125588dcd04ea186722a7e3541b06ce889436
font_01_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 18616 bytes
SHA-256: 604165cf24c596ae08425692b640e190681cb5f0716986d4a5d41bbcee5a9c02