Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef29fa7c2a33b1b…

MALICIOUS

PDF

73.4 KB Created: 2021-09-27 13:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: afa7648699fc5e572300fb225d5dbc7f SHA-1: 111a71884cb005ad2d2d9a79d0689ed97bfc8322 SHA-256: fef29fa7c2a33b1bb8df0448e984288fc00978c27f1ce01388e2e5aecca44505
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=earth+science+tarbuck+pdf PDF link annotation
    • http://happyorderfood.com/uploads/files/60261584709.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/44939676170.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/letasejew.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/57126987670.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/59541955008.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/mipaneb.pdfIn PDF document text
    • http://chikatere.com/Upload/files/xorusawoj.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/nanavikifonalo.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/lifisitopeje.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/92832946602.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/makinanewovutopufevorabap.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/pularezomowefoj.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/riminatazovutipaxikelad.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/vumam.pdfIn PDF document text
    • https://successalpha.team/upload/files/birusazod.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16134445519968---45072279414.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/2910577943.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161440dd6105b1---27018372786.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/89379039cd6e94f2bfb2993b82195595/38632474245.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/46849535713.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/70162944032.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141673ad03c9---xajazuragaviwosat.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_off0000b50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50A 19496 bytes
SHA-256: 8d8dfbecfe7edc974d5fccba6b269f1a15d83bdb6eafe541df66db5a8420687d
font_01_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 10868 bytes
SHA-256: 2cdecd75f0590f7f2f33eac825a1fdfba2f8f84e5e235fcb4ff519310ec251c9

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