Malicious PDF — malware analysis report

Static analysis result for SHA-256 c004cd81b9f3d423…

MALICIOUS

PDF

90.7 KB Created: 2021-08-24 00:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29ac36c850372a2f10dcddd1692c16d2 SHA-1: c5f573a711240a08bb27f169616cc452d2d6e699 SHA-256: c004cd81b9f3d423c8144417347dc9bced1105d4f67aaced8e35b281b0363f77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to websites that appear to be compromised WordPress installations, as indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/i5vf70vsp5hpupiafd63jsr7bm/39712851613.pdf In PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25af1923c---89626698085.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3d08a9cda9b71423c0c1e2762afb92f3/xifituwunodubuzameram.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/bixofezudawinijole.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/fetufuwatetoxa.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/61142118440.pdfIn PDF document text
    • http://cga82.com/admin/File/24675838600.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/56975245446.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/16374150455.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/f6430d319191b3066aff901821951670.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/3559274247.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f507b202aac110a27cbfeec40be45c2f/77695037392.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e08d3762ae3---pufugiwebav.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/102cd6e7e9e992288a444039fc199bfe/letamasax.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/wedokukegufan.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d8c0e8191---leduxokexok.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/dowetato.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/97641340405.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bu5qae35mihj8kr44pg06l7uft/77095023557.pdfIn PDF document text
    • http://namngonviet.com/user-/files/mivujatajapakovipatos.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7567282154bff23bb8861a067c6e1ec2/bazubezodegix.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/pibenefiden.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/zikurofejigeludezis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=n+accent+spanishPDF 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_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 21828 bytes
SHA-256: 14d770cdbf8f456a09c8451c482fa7b9e428fb4fb0878cb91c88016184908c83
font_01_sfnt_off00012d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D77 10184 bytes
SHA-256: 78ac46b5feece43aa11b2d2af90176e94f2510457a74b584b0cf9bdce2636fdc
font_02_sfnt_off00014438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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