Malicious PDF — malware analysis report

Static analysis result for SHA-256 551fef84f41a02e4…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 16:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9fa846a9d8ad7dccb62845955393d8d SHA-1: 62072bd36b4808aa1ec17f8e3930f1bf97df7cc5 SHA-256: 551fef84f41a02e450143621b594147c80a4f044f8cd3ed6cd48965d7f19e051
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, and one specifically uses a 'bank account opening form' lure. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body is heavily obfuscated, preventing a clear understanding of its direct intent, but the overall pattern suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://krisoc.ru/uplcv?utm_term=yes+bank+account+opening+form+pdf PDF link annotation
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0601560026fb54ad932fb7b40ed3d81/kepisatuzosafanaranaxopij.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/56584118101.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/gefanit.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b477c78d584---17298645398.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/zevudolefewurasanegop.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/61541985247.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/95513992736.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16107a63ab6bbd---nojesewegeroxunajodudun.pdfIn PDF document text
    • http://pk.mo/userfiles/file/1581413011.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/507319110.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/durupevakovufu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa5a662c4---91844163385.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c678a47b187---timaledilafuzafupiwezadev.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/619132cd19b2287cb916d1eb601a1ccd/59365589346.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/r45d38mc5aij97314uo2a8hu64/957988470.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ea675a9d4724f231f9a549849d33e813/96234264648.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/22190917820.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e2f735e9f201f696fed424f3af22b000/jazetimuwepagimemisamono.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/nufutadagewerewugavim.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/031232188571.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/86038107733.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/984003b9312b0ff6a4def921663ab1b1/vonavawiw.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/c5cd1d39e7fe092861b8521dee500b73/48335931611.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/domalokepika.pdfIn PDF document text
    • http://wamer.org/userfiles/file/gewefojevalufo.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080ceaae5ffd---lagalukofopuxupuf.pdfIn PDF document text
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC795 15548 bytes
SHA-256: 141c8b071594fa0a2530544f795e9d64be03dbb8c9f20919aec1b9ed294ab4b6
font_01_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 11232 bytes
SHA-256: d50f73a70aae6424e52d30a9c6211ff7249da297e808a5a1feb53813b3292bc5

Open this report in the interactive analyzer, or submit your own file for analysis.