Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1188a3f4333897…

MALICIOUS

PDF

112.0 KB Created: 2021-08-14 06:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: bde224152eea9eee1e01efe77cf111ff SHA-1: fd23cc28cd07604f1c29001826cf6a6910716a0a SHA-256: fd1188a3f43338972a73bd6150f91d41c40adb47806c616fa2109bfe0a4a4dff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the overall structure suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/9271730442.pdf In PDF document text
    • http://qqsbg.net/uploads/file/41029894703.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/mibolimojokavakijado.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/52570775868.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/95208727015.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/83294189610f5e7574a5d.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/6671014925.pdfIn PDF document text
    • http://babamoleskine.com/files/file/19535106910.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/73356792020.pdfIn PDF document text
    • http://hangquangauto.com/files/jovubexoxetud.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/kobeduwubogedepi.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/29aada5bb85c06c4aa4303e3a3489da7/jujokatiduvawimunoriwonu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feaccc39ab---38289170149.pdfIn PDF document text
    • https://artbynela.com/uploads/file/vojakubarekutuxikas.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/nutizejokajizu.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/82508182528.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/5tvtbotkr98i5731ekvud9pq1q/61954905730.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/pizapotetutuduxiv.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/77a7435c9d731bd2bf0837bb73682c23/84191834037.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f5398e560---53618772883.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/67538409789.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/pudetojatufevuforebuvomak.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a632274a---20682136735.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/18028720997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+infinity+gauntlet+mod+1.12.2+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000138ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FF 16064 bytes
SHA-256: a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16
font_01_sfnt_off00014e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001662a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1662A 11184 bytes
SHA-256: 903d4b115600e93b2246f088dc920086edf8bcf3ab087ad795e6262c88438766
font_03_sfnt_off0001804b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1804B 18800 bytes
SHA-256: e48e0684b85d44490a209415bc0393b4de92e78ea3618971b586cee3aeeca6fa

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