Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fa6e27022fe608…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 10:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2631a029303ab92684eea215d8ed0aa9 SHA-1: 8a798e73e5b87430e2dc956f51781e95e239455b SHA-256: b1fa6e27022fe6081861cbeb858d7f851a4436f2815c4def050cc2195971d016
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary function is to host and present these malicious links. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=cartoon+craft+free+download PDF link annotation
    • https://envirotechindia.net/admin/userfiles/file/motipipugosebelamafi.pdfIn PDF document text
    • http://precisao.org/files/files/gabepaguzukinaku.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/50355660733.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/43847438290.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/52115598199.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/medoliwosowofu.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/62040698968.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/2960854438.pdfIn PDF document text
    • http://gespk.com/userfiles/file/44595084891.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/kokefejegeza.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/kujugefasivixuxaxa.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/47870302492.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/35718fc00dc595a19d11fb2d40041898/lexelojekazofumo.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bfe4ce8f5486fdf6213bc5480672b105/nukovalomami.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7c0ab885d---nuvesokadesadarexuz.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/tijukozamudumo.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/totozulowijebopojevado.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l81lh7tnhghi2r0r6k4v1fkmk1/66055284340.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/6e8f9f8837b98203ef7bc3d81485deee/ganazetulalobitademibux.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/levuwatukobu.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/bujakopikedaxerepudarem.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210917055406.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/nuxuwakofivofix.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_off0000b3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 16384 bytes
SHA-256: 09f41910b16b73763c8de3494a78db4d53dffa542454abab04386cbc4315c67a
font_02_sfnt_off0000f5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 10328 bytes
SHA-256: 618edfa8bba423550d535a5dfc54bbb2886c9e83443e9514861999a99d3f05a4

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