Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b121fba4c047115…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 11:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 373b8359406d3330c8010c95f4503a19 SHA-1: 7b621e75414b413f439b782a70e211c848c11885 SHA-256: 8b121fba4c04711597821b55478002510b5a4c2884741944f9deed8e8e716b4a
176 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number for fake issues. While no scripts were directly extracted, the presence of embedded URLs pointing to compromised CMS upload directories suggests a potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://le-bouquet.be/userfiles/files/keridija.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d1808c2d93fc7d34690854ca31b12e58/fubotigutizumam.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/kafixijobivab.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5401459185e20e53a785dafbd2fe2e33/74419280848.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210816235006.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/34262566156.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102fac824b0d---zojaner.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/jidezekobovajazijobi.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/be27c2341f7291fc7def4af8b204fa3b/karexiderumutumamirepevo.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/80300313856.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/gelobap.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/21024665024.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97bdbc991---zafesilomoxiwoji.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/fakosewoserinegosejuvike.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/gasivojalevotalasebu.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/gedosipifowudowes.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/zukurozenafunot.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210830033246.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/68152847666.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/fusan.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/xazefip.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/lugujadadopal.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/uism64709nflh740bn85as2o8c/doveparotapasafuwefi.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/492d098d92efd119c2b86659723fa81d/53124228929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=toyotismo+caracteristicas+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD854 19380 bytes
SHA-256: e84da1ccbde4fda744b00d426e1321b87695be4456c2ef0debf22f433d613868
font_01_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 10708 bytes
SHA-256: 7de784ca283090098c6904e4a637777690b115cc5485f72400d8f913f00c6356

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