Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2cc7419fafe86c…

MALICIOUS

PDF

85.2 KB Created: 2021-06-30 01:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45426cb3d7e35059bda69a01f95b0c1c SHA-1: b5002fe1fc9d4d1aeb3cecf48fd48b357a59a55a SHA-256: 5d2cc7419fafe86c392421b840f314268fc83c3418e0686cd095cb4eacfdf76b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to lead users to malicious sites, potentially leveraging embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://firesystem.ro/imagini_ws/napepobiwami.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/397072486006bcecf08150c02a1aa2a5/xosago.pdf
    • https://bataretak.com/img/files/file/dinemizolofarixebidewog.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf841c3b9---30782900948.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/16087883051.pdf
    • http://edilgroupdigiovanni.it/userfiles/files/koledofumafubeneg.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607781d645b6b---14895285270.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/d5mf1m8vld9ajpqd2r5s6cqdeg/39981634555.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ce9d068ae58e3907b220d6b37b416cc0/rejijew.pdf
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/026a421331dd8fc356e8e8b0ea4b5f3d/30472038413.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/194e18b7d95bce77871a502ac90ef534/jumoxor.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abeb6c521e9---sikoxifezaduri.pdf
    • http://mosvag.ru/img/lib/file/sizurenoxozodevaxenab.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/33194053293.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6ede401ca0b8e75519966711d29e27b5/42302235521.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea4b67e11---womozizof.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4bd838c08---futaropemetaxubogibov.pdf
    • http://abwcoliseum.com/uploads/files/93278194310.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9737c888---penugifuluvuwemu.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969229a3593---82465515140.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ob4f7ecu321onu8v66vh3s5o30/noxepe.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/99214c98368fe4a5f93532d2224ada7c/gopitobafemalipifoxox.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/s2qmvnosirbh1r046neth72ou6/dotipemojurunikatakasu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fll+to+sap
    • 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_off0000eb6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 16792 bytes
font_01_sfnt_off0001037d.bin
f6cf304e84001f42ecfb5f0a9a9c93d27ba43a59cb22aad35bdd3db3132056a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 17944 bytes
font_02_sfnt_off0001312e.bin
fa016faa7e828592d64bfa52d8bed84b026fdf9241054ded10999f2bba0c448a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1312E 9792 bytes