Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bfc3054d75801c…

MALICIOUS

PDF

89.9 KB Created: 2021-07-07 19:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d656d9cb4480b8b6877ea8f1da9f29cb SHA-1: 6de834d225b34e06df78642fac50d54ab2646b3b SHA-256: 20bfc3054d75801c9fc0d9c8ada775aa248d93fcb2fa6f153d648695dd5f8406
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=set+for+life+draw+1808 PDF link annotation
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc45a32c916---90586940904.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee1c835951---23048630569.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/031c38bb2adc0f30069d426386db297f/47796431638.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/70019628089.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/rojubegafutu.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/wisirubasikajuputu.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/62197220468.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/51736989668.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xizemokatuz.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/fca8e0e2c6ad24779434d07408a04605/joxawana.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/94292358782.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160832944eed7a---zobusajuvumokonedafewixi.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/a1806bf7ae4c09eeefa2438398ac2711/32592695113.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/64241965867.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/77387092295.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2cdc4564---zinatuwobosudeborufeg.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/fasokerujuluzugadax.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/34406951209.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6eff8a285d139190a4657d12de1c8d8b/lobesadamanari.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace96ddebe---bamopibi.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075cce1c23ad---8744186104.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f3faa501c---golikapugudiwoxagufewagi.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_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 17224 bytes
SHA-256: f6b6780134b51a4dabdd58385ef9d93b424d8d910054daa802b53c5f3fb26442
font_01_sfnt_off000129cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E2 10620 bytes
SHA-256: a11b6671af6b12ceb921336b678219f9ec2d27728e1f8013b8aae31ba433ac43

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