Malicious PDF — malware analysis report

Static analysis result for SHA-256 071c879a6182c7a2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 13:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 38b311f71924e0e58e52e75ea354a214 SHA-1: 3083b9961aa077a0a3c532a9103773b9839941ee SHA-256: 071c879a6182c7a2dfb3924ad029d30a30031d68efb0bc875e48940343984085
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload storage, 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. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=nova+launcher+prime+apk PDF link annotation
    • http://qapoll.com/2015/vat/upload/files/wuves.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/85793023375.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/26402854385.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/84831017073.pdfIn PDF document text
    • http://theponghop.com/upload/files/gutef.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210901/files/20210901211709.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/mafarigowutejukonuwapof.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/64023481000.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/bogezigevodukileda.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d6b0049fe2ff644e44f8465d777d0bca/20497374626.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/nipibavuvowevoraginagefa.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/wemojokarudoneweri.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/99940129901.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb50c76e15---97839037954.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/lufifarelolav.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/valimivupifawovut.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/96344491246.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/jiniwigu.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/mefaxowodafubitizofej.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/4923939263.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/25829965031.pdfIn PDF document text
    • http://chongros.com/userData/board/file/50813795849.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/puzepuzumi.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/36808068506.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f488a5d701---90997692918.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_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 21264 bytes
SHA-256: cdb1766d4ba2aebcfc07f900b7284245a91fa4750a13025b43c86ef2f1cfae35
font_01_sfnt_off00010c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 10608 bytes
SHA-256: 936ad855ea5b7ca4e4c3b8abe0226588b781b5842dba51aaa895a1f695b85e9e
font_02_sfnt_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1