Malicious PDF — malware analysis report

Static analysis result for SHA-256 6128e21fd541721b…

MALICIOUS

PDF

85.7 KB Created: 2021-06-28 12:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a410a4bff668470ccfaff2f584368831 SHA-1: 139c489e238556709a51ed149ada68c49c4721d0 SHA-256: 6128e21fd541721bf0cc179c8ae283bf6c7a9acd82c387816d64d2bc16407baa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://angeladaniel.eu/uploads/files/boxozib.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05f536d819---vutumekujunu.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/pigir.pdf
    • https://faprosid.com/file/31783932916.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e95b81a5---sazer.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/kp7dov2gts0bhkkqabn2ke9tb1/47980460149.pdf
    • http://ubest.ru/images/file/39918492915.pdf
    • http://commsoft.nu/demo/ktb/wsmbilder/files/walizegu.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa21641ea3---ruvala.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8067e721531d59d8910378320117f866/78759287403.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/oevec216ugitg0p3jtvhs7rrd6/susenedugiwitivezuxajit.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d77ef9619680acf188381de54722ee1c/sepawu.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede8c5ecab---75247427426.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b8fbb0b80---ritis.pdf
    • http://curry-box-deluxe.de/userfiles/file/raxozonogefajipawuni.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/97c0f6847a537e962c42f5a9ea08e2d3/sekilefubuve.pdf
    • http://headrepublic.pl/images/files/39499166797.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/18c858fb40037ba5780d63e33c4535a6/67302129445.pdf
    • http://brilspa.ro/userfiles/file///wejosepojetemude.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/pjvp0qvuue5nci2nitfv2dmnjq/rejazotabovawejadamirap.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/98b6ebbc60e28d54ef073c8f89518554/kovewufipevila.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607864db32a7e---60197169934.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/37a15b399509f1918f1d621293297dbd/moxodufuz.pdf
    • https://majorsagilekvaros.hu/uploads/file/89911796214.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8307645a5---60933997378.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mapes+canopy+colors
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 16792 bytes
font_01_sfnt_off00010565.bin
ec3d6a962118cfbccd6a896174320a57960b22444ce28af794554955f2a3f77c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 16700 bytes
font_02_sfnt_off000130d5.bin
3435ee5e201fd891038f0665a97af08e29620bae5cfbc52fa660ad57a3fb403d
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D5 10284 bytes