Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6d6f8d2b4ba4c2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 11:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 11e5aa362126f22123b380e4baddda90 SHA-1: 7c7459b815748d7cbd2cf2512dd7d908c786c59d SHA-256: 0f6d6f8d2b4ba4c2d5102e0c3eb35262c32d85cd8214805393a00193511ba3a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613cee1c2fc15---giduxilukamawovatuwiki.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/r692rbpgu6t32aqb9aqb7blt71/vekitorojizivupumuzone.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/69071342589.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/lopurujisazefipe.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/62724269711.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadf869327---rinapusikebabixorozugonaw.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/76221204014.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/wewuk.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/nofuriraxasajadebenibeti.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b85f569bd2---senufizivilokaxitosupe.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/10843273995.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e54294c2b---sumufufub.pdfIn PDF document text
    • http://www.ezmoving.com/file/zetuwukujelisirexakaxited.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/daviwapilupomila.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425fc39e321---xubonakoposexagej.pdfIn PDF document text
    • https://congchung7.vn/upload/file/vorepaw.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/19220986702.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/noxoxunamosubot.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/ranagobol.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/mekimuduxuwuperufoka.pdfIn PDF document text
    • http://holzbau-napetschnig.at/wemabujoxufo.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/45262375429.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/48300125637.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/92eb2bc6917a76b6e1f879a7801999f6/93092501624.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/95494047290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+text+soundsPDF link annotation
    • 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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 10216 bytes
SHA-256: fb344c2d69db888e0fb1b4e3c471fb7ed54fe8668b7f5f3bdadb8552aab3e12f
font_01_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 17880 bytes
SHA-256: 2c3416d80b1bedb594c6e12fcaa882fad9bbdfc74c780e93ed5604876e2c9117
font_02_sfnt_off00011f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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