Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb56ce7bdd947373…

MALICIOUS

PDF

69.6 KB Created: 2021-09-05 12:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a8424251b4db8d15d4e867ea125c2af SHA-1: 1f80878401bb900064bc3b7d930b9bed6ccc6e16 SHA-256: fb56ce7bdd947373edcef55411fc3008c6a1f8d00ae9196ab01b4ff3a591c79d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to domains that appear to be compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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
  • 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://stdtekstil.com/upload/ckfinder/files/30484802080.pdf In PDF document text
    • http://waberry1969.com/clients/877040/File/xipuzaritezovawakavu.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/9326240932.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a4efa1f19e---10144837073.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/weritoj.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/sizatogabafezoxabij.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608124d3b286f---41564407880.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4abe1d1199---12502957150.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/73411527740.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/gedorefafotiwir.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/56950859209.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/20fb015d4597578cfb152a1532ea27be/24155092213.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/43548033880.pdfIn PDF document text
    • http://ezibra.pl/upload//file/24735757910.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079669ec431c---65471167992.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/84137238939.pdfIn PDF document text
    • https://avenue102.com/uploads/file/kuvumatefonobut.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa96934a098---xonezuneverodumofo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/7j3gll601l5vrtet87hr4gj56t/tunuzusigene.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/bilivufosiposuz.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/xesugirisiroguj.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0f19ae80907740cd68537f690cce7408/tamugogevojerefivigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=time+worksheets+ks2+printablePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB357 14588 bytes
SHA-256: 64ca6c7e616c2f24db6df94c2eb984dccbe3544f09dfbfef4335ddb0666269d5
font_01_sfnt_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 10916 bytes
SHA-256: 2e2d707e788fb086cd11acae2a3a2658f20ff866b277fb086f7e7f168cd9b558
font_02_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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