Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c770b93824da2f…

MALICIOUS

PDF

90.9 KB Created: 2021-06-27 09:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 25a781e0077156f91fd81f29a6a66b31 SHA-1: 1cea63e27c3150ce3dbcede96fd67fcccfdccc68 SHA-256: 34c770b93824da2f537ebc28b865ed5b237fce7706243e4610dcd52e0d2a21b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads, suggesting a link farm designed to distribute malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt an archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=sims+3+all+expansions+and+stuff+packs+free+download PDF link annotation
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/kd28m6ue2poue3flqujj2j926l/zogaxixodixomelazoba.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/gulijetanikinubatoviduzab.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/56877090955.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbefa5b40f---13530909206.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/b2092pskvtkm03tg1tnptpeo39/16640854520.pdfIn PDF document text
    • http://changdahk.com/upload/lozatul.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/s1g4c9mjgakeh47d9ps0sjljje/zatolifevinilizejow.pdfIn PDF document text
    • https://x-software.cz/data/file/nifumofizegiketatopet.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/12472934095.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1b50b126---vumunekelujes.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/14962155230.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087a660d7c46---1939689668.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef8fefd0721b1225deb6df112244d26e/jinugepekijusufuzovu.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/95162302701.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/786f17ba9e799d0423f4ee3a7d871803/wukakebukilumi.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/85909264435.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/38642318610.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/27287040438.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/tebibegetit.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b16de0dcaab---15220852851.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5bf32b295---lilobixuxepusiwevus.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210611182109_fenkcr.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_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 16948 bytes
SHA-256: 97644bde8eb2ef80144e7abc41e45cb7fc9ce12518eb686ef6dda2ab91186ea3
font_01_sfnt_off00012b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B56 11408 bytes
SHA-256: baa0eb643b52ee375ca7d1fc3eb98b6ddd9092191019f5da6870165713a550ea
font_02_sfnt_off0001464a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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