Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf4b963bbbda80f…

MALICIOUS

PDF

74.2 KB Created: 2021-09-09 04:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4aec18644e6b5f7666602db1f97d9ab2 SHA-1: b1ad68503403705d26060d81cc678bb97b020728 SHA-256: faf4b963bbbda80fb03c92eb3538aef4d6f509cac23fffbdd075e9c5f6eb52c0
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, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://www.centralperdana.com/file/pafufuxagijafisab.pdf In PDF document text
    • https://archielectronics.com/userfiles/files/xubogavitovomixebusubunuj.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuwepokakizomevolumekem.pdfIn PDF document text
    • https://matrixx.lu/images/zinir.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/26369947246.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/zovowevenaninemotode.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613612f46155f---zinuzotijusen.pdfIn PDF document text
    • http://zamgph.com/uploads/file/090430079288.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/52410707902.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/kijerakepuwitabelu.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/83628158235.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///74143837776.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/93743647873.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/gapupunujugonilemujaxifuj.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/bomipewimofow.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-8/20210908084800367329.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/madadepaxajolotiropewin.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/13974804026.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/14769846425.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/zupizajofetal.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/kenizib.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/tivexo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b55f6849b---31917204383.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/20661585640.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/6103a832e7b92aad61b0f202a981fda6/poparadametitoniwop.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/noxizegodor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+chrome+alternative+androidPDF 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_off0000bf60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF60 16428 bytes
SHA-256: b829c3ca9a22d40e6f08ee306514092799ba5f5accba0ec5a17ee04eb092755f
font_01_sfnt_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 10752 bytes
SHA-256: 3d40a9e32e3405cd31751ca62f02e7d7f9110bf57c417d0b8857fa2915e2610e
font_02_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1