Malicious PDF — malware analysis report

Static analysis result for SHA-256 686b12c35f60c36f…

MALICIOUS

PDF

79.7 KB Created: 2021-07-03 19:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86e06a67d29a10c49a01321e2f8d1264 SHA-1: 8ab0b16889eeefd2d824ac6e4504399d1aa45d5a SHA-256: 686b12c35f60c36f3d96d197bd51348e4ac0bdb8b7715ea9c5fafc50cc78e028
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous URLs indicates a primary function of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://akkoryazilim.com/userfiles/file/zarigubip.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f4896bdd7---22211567781.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2340d7cf23fa193ec63776d3fb783136/54960965514.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/43dd997f6c838a757fe82470d3183ca1/55581100816.pdf
    • https://edusfera.pl/upload/file/wobipamawenafotop.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65b08010e---vifukalanezimapivagag.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607262560aa88---90600907554.pdf
    • https://landbar.com/upload/files/45583158882.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c462176eb7b---73128246403.pdf
    • http://brkvinc.com/userfiles/file/82019709496.pdf
    • https://communeouchamps.fr/userfiles/file/2420246572.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/60069899592.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160997ba3d6eb7---nofexafa.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2ed036c640cb74f0eb6ac1c72b3da53d/13201371057.pdf
    • https://allcreaturesinc.com/files/files/13727865710.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ghsldh15dhkdt22vl23nl94gdc/voxominubovo.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b856f1ca99---kigizezani.pdf
    • http://top1np.com/ckfinder/userfiles/files/jobavuzivevum.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2tr067h29919rcljop63sto59m/94404114861.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a9f570dc3---32808281061.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844671d501a---tuwetovenivogo.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e34a85953315daae6c8a8135de26f3b6/52709713213.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ece755b19890f544c99ab76ae580653/jutenumejisakuzopevizumu.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ac834b1f---92701717204.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=a+taxonomy+for+learning+teaching+and+assessing+pdf
    • 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_off0000d0d4.bin
905caaba20b85d25381586724547d4f62e23503616c903d61cf3e7ac8ec11b48
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D4 17016 bytes
font_01_sfnt_off0000fd4a.bin
e8ec7dfb442d49f00ad615211520b2ef13b05781d1f3190763eaf52b3d5ea7b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 11264 bytes
font_02_sfnt_off0001175b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1175B 16792 bytes