Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc853ec24777a48…

MALICIOUS

PDF

180.5 KB Created: 2021-08-31 03:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b182ecefa0a705645241145c5ce8ae72 SHA-1: 4396f888aee6916a3de727f79c198da5a5f8a01e SHA-256: 7fc853ec24777a48eecbcbd0958e5fe94efb76d0828f7478d5a8c8c5966c5e5f
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a large number of links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific intent beyond the link farm structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7134

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/k2us8e94rn38esi9d3ojo2co84/93541027056.pdf In PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609071f7a90d2---ribasurobov.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/6473125996.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/57167350374.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/faden.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/p705viduldcc5fahtoj6a2n9f6/17655917812.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/db8moq34mt1rta97hcqvu5j1h0/2205320961.pdfIn PDF document text
    • http://gabortech.com/admin/file/2372488992.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/dixotejekij.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/18450824607.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/3b2dd0a430a792bb99122150b390f305/poritutidibi.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/lowazipoloxigo.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b6c0015a2100d39fb1381cef670c788e/97841565705.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/1a7ab4703de25e2d2b7198c7f5df8d4f/gusuzubiselobusidarepa.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/036fc81f055c92ff05bc263a11bb136d/41788487737.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608da73bbfdd0---39971050364.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ce3ba6a9---4052972187.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d920a9cf6b491024a93a5b325b53a27a/weligudere.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/mumewefekirojebatemakel.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4a341a231---29235077218.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d131085524---27375903766.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/nabuposadipop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+other+psychoanalysisPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002739b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2739B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00028bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28BAD 22220 bytes
SHA-256: cb3fd21b4e12116f00412df285b4e0a84600517d6f66c79d1dfefed6fbacca64