Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1a63ab891d51f3…

MALICIOUS

PDF

87.2 KB Created: 2021-06-30 03:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b93dc078c3cfd68a10f4f3699847a41 SHA-1: 5dc76181fb3a56039f059d19bfc5f95792d5dc88 SHA-256: 3d1a63ab891d51f3ffdbd94d0a27d8b14b8115bdf1645293750c6591090cb3aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories. These links likely serve to distribute phishing content or malware, aligning with the Spearphishing Attachment technique.

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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6c6374244---67761935882.pdf
    • http://bike-aholic.com/UserFiles/file/sowogisuruzir.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc036648ab---76964470351.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c18f9098d6---81245694667.pdf
    • http://zovsh.com/Uploadfiles/files/29730602642.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/743f48ef9ef2dc828bf0752a859e4ee3/31554850980.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/nshdn8fn2211qqir46opnfnn0m/70425097259.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075a82c11d09---vopovukit.pdf
    • http://fipjp.com/userfiles/file/25775501719.pdf
    • http://ilksolar.com/Images/Media/files/83449900979.pdf
    • http://amuseonline.com/absite/userfiles/file/51596120674.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c3541ef11---97972569035.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0d1804012---85869669083.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/6a8qh0u7rfp05schhjd1jmibhs/76857725120.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6t2bls9jdffmvtorkpppspr57m/34978695162.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/4763227aab5e166340a16bf594eb2c8e/9194040239.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160771f0c91c30---wuwanefuwiwudusalamu.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/t2v98tf1asd3mjs1suctbq2kfn/semalijesozaladadejoj.pdf
    • http://biurod9.pl/public/userfiles/file/putotuponugu.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/dmsd9ohcb80372h1pag3a0h1el/xapidaw.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607820e89f80b---2529238030.pdf
    • http://dailyxedayhang.com/userfiles/files/1300469510.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0c4629f31177b225a6fb9c989a093fb6/83866713184.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da707b02674---42267050107.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/73c7cb8ae8d75110d782a8b5b6c1e171/36935348117.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/3f6a81b951ba55523ca819d6f4b017ea/robimivawegevozovomifabew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=eso+arbiter+of+perfection+solution
    • 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_off0000efd1.bin
4a8bd44bea7d072daec9d81c50d9f8e4fc606de800a673fb84f9f9d0ac5c702e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 10696 bytes
font_01_sfnt_off00010842.bin
60e909f8d3dbd9181949e66133d308d065254a21a8ecd958eaaa4afc28f98eed
pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 17400 bytes
font_02_sfnt_off000135db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135DB 16792 bytes