Malicious PDF — malware analysis report

Static analysis result for SHA-256 14128cf64c7424b7…

MALICIOUS

PDF

100.7 KB Created: 2021-07-30 06:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee84b3812afa0499f5fda185094630b9 SHA-1: 1119db15fa06bef830f7f2e9a12aa55d96a0978b SHA-256: 14128cf64c7424b7ed1784d8d08eccb0e6f7e1fbcd15ea40865bb34bb6209624
181 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. The document body contains numerous URLs pointing to other PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content, likely as part of a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • PDF advertises pirated movie streaming/download medium PDF_PIRACY_STREAMING_LURE
    PDF rendered text advertises free full-movie streaming or download using piracy-brand names or a 'full movie + download/free/watch' intent phrase — recovered after folding the styled Unicode confusables the campaign uses to hide those keywords from plain-text detection. These are disposable SEO-spam carriers that route users to malvertising, fake-player, and scam pages; the PDF itself is inert.
  • 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://gapoom.com/upload/fckeditor/file/81711341833.pdf In PDF document text
    • https://webornate.com/viking1/uploads/files/bosafuzaxelabut.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021061822380270554.pdfIn PDF document text
    • https://botroul.be/uploads/dexadikekorigotaxebijevi.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/41520082565.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/59245843254.pdfIn PDF document text
    • http://tavcam.com/upload/ckfinder/files/lufinazubujimalenetegufev.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/79449685740.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16086392e66b64---66551200874.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d7463abda---80381082070.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/tazamuvafix.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/29822389073.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/21746323009.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/95387207208.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39a70146e---wumomilim.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8gad5usnd8ig6umum1dgqtnbet/lagufimipave.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/fepaxat.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/ditudapan.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef46bf33cc---mijibodozexibudulixu.pdfIn PDF document text
    • https://proia.bg/userfiles/file/20711112090.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/60835343146.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/sodutukin.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/dogezasonijilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=manuale+istruzioni+folletto+vk+150+italianoPDF 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 extracted file (font_00_sfnt_off00012263.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off00012263.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 18336 bytes
SHA-256: 66eb4d063d3eb99ccd1064aa8b83e8d045a60d8940a6129063b73055d42bf6ec
font_01_sfnt_off0001515b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16972 10828 bytes
SHA-256: 7b4db6c5dc14a1609a9340f3ba66b899b016dd15cff7fde1bd483ed9043ad1ea