Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d22dffa48d33f0…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 08:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 949748585c3c23af3614999a402a3618 SHA-1: a71aec880ef777078bec37ee4b9f386c2bd80045 SHA-256: a7d22dffa48d33f0c5c7e416d0397f2cb5dfb0742d1d7ba68b276daa321878d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded links and the nature of the heuristics point towards an attempt to exploit user trust through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=four+day+clearance+2021+online PDF link annotation
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/a5741402bj5kvpg0cpql6hchf6/jeloba.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/26464712357.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/0f2f7e7f30d67bcf4e912b9d7c59d7ce/63017967698.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/5975852252f5a7dba2de958355aa6a3c/35823967682.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4291dc479058f438e85007a3cbc0decb/ligabaturavurofuxarunite.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/fowule.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/pinomitupanuxewis.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/zigaranupeso.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a6938b06d03782f85b9b9b0834f98c54/resofinarodunawomoto.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/xasused.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/lenatepefunuvoda.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3104f70a03---munivugudosutofe.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5bc99e924---tegemilarebosazefomakaxog.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202151292527305.pdfIn PDF document text
    • http://fullx.net/files/nojikekotobovaxipolunaj.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/k2vh850053t9pfjhgk47r9171o/66002588059.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087d08623f0d---denabotuv.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/09b61e7bc8aa19bb83467f86203f9480/folusefiximudifu.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/xutagedelutaxebalixofaz.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/zikovogapakesupujid.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/h44kloif542qevk090ltqk0d68/39282750531.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/318465dccd44a664c0dc766dcf445b0f/mekoxobetujijivufup.pdfIn PDF document text
    • https://mmszke.hu/files/file/sugiviloxeb.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f9fcc62a8---17211834525.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a865be46fb6---12274236641.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090696749148---25273163200.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9f0b7ad5d97549a6dc2b830e3187274f/5315095158.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_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 17620 bytes
SHA-256: 287a5375ef33023a31c87e77fa6c2a4a9cc21614e658dac13ecd34423e35750e
font_01_sfnt_off00011b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B95 10580 bytes
SHA-256: 58b912f7cf77a3fe925a8c8934807527120c9243f41a8052248cad04d9c06b2c
font_02_sfnt_off000133e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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