Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5833d4fe1c6952…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 04:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26fb6946527a661c837681be86566565 SHA-1: 0fb1d5be0b31cd4ec34478dd832787b443ab09e5 SHA-256: 6b5833d4fe1c6952a9ff82e60e9340677b983ff2ff607e2e7955b0a9cf78ea94
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=ikea+ugn+manual+d%C3%A5tid PDF link annotation
    • http://springgalleryng.com/Images_upload/files/26713088143.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb836a6ffe1---1102697083.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/91657411999.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/tnb61cj8gprkadmjucma4g56bs/31595194281.pdfIn PDF document text
    • https://lojaortigas.com/ckfinder/files/rofomusaxajejovos.pdfIn PDF document text
    • http://liyangah.com/Upload/file/dogazuxoxodefakikugugavu.pdfIn PDF document text
    • http://e-hane.com/files/jolavomuzalozex.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba82536f47---tugisukoxoraro.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/97550415669.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7lf7lbg2bvhgnomh2an75csjek/sefodepitonuwunom.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3f578862b---rofukavafepebuxatakevij.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/13499058125.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/pekimon.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a028e261e92---24670665477.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822b4ff15c5---61103163145.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/14254238593.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/xovumepifasepapupebiredu.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/90018020544.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/80546053418.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/bffe315a4f17d2363b4e819b31ed7c47/82061878563.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/vepoxe.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3e4737785cb63e5049ec3403469f7c77/50119015461.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///55942339201.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_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 20328 bytes
SHA-256: f7a4a808feac963ba8378666b5fe27c971fa3f887e759caffad4005201649bda
font_02_sfnt_off0001235a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 10608 bytes
SHA-256: 1f3d5bfc892af61754223d03f8ef6574ee9e84e7b91d672c82e4c705846b023a

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