Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd12c4c83874eb2…

MALICIOUS

PDF

92.4 KB Created: 2021-06-30 14:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f10ed87b942c7aac5517b521d3f94277 SHA-1: ffd4f82b861cf941a5b46f4caaf43b63c05e4b22 SHA-256: 0cd12c4c83874eb2e007ef12084ba0d75af233b7e6144437dba2728240dc2b99
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users to phishing pages or download further malware. The presence of multiple external URIs and a link farm structure strongly suggests a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://vandolderskb.com/images/usr/wugubitijirum.pdf
    • http://kolaykanal.com/userfiles/files/18090597920.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/93df1e6f3a6367cd11996fccdaf24b4e/47693942730.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/lexededesotujejibexotuwi.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/b0vrbgc9iu15ho1afq42sheh0g/xukebirom.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/6b23342a8093e5f366f1056ba51a1ade/majizojaxadefapudejowi.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/bowatijoguwififila.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bcb2a75ec---82238720550.pdf
    • https://cissud.com/uploads/ck_editor/files/xifefejobapabesag.pdf
    • https://villatoscana-pi.it/userfiles/file/lanejopudusol.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4bea4333---44768128771.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfeaebac100---nexixupumuban.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c867480e14---46536408706.pdf
    • http://all-pass.com/folder/editor/file/2500882249.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d85b5e7ac3d---88288285387.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847f3f45c8d---3245723265.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/43111811548.pdf
    • http://pnmanagementsolutions.in/uploads/32398861190.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609acdc056481---7592054013.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8139eea8e4ee6ce54c6933202abef7c3/robonilelifuresubedi.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7288c61d8d03a8d3ff2659f4e3596972/borarefigomijileworeg.pdf
    • http://laclonghotel.vn/upload/files/nizedinoju.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae45c525a68---lalumu.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f74d8e3f59d0b6006bae08ef1b1a4ac0/89950286933.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/v716l9h0h5s9egn93fcvpo2pig/73379270113.pdf
    • http://anvlaw.com/userfiles/file/80699342111.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bond+enthalpy+and+enthalpy+of+reaction
    • 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_off000102b2.bin
eeae47e424efa4e3b087af4131c2129e7dbd5f312e48f280261346971d3993a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 10716 bytes
font_01_sfnt_off00011b3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 16792 bytes
font_02_sfnt_off0001334e.bin
4a31e861b24c1e7be1af59411986c969fb1a4b956930884392d664ffdac81369
pdf-font-stream PDF embedded font (sfnt) at offset 0x1334E 18248 bytes