Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03501d0e74d05cc…

MALICIOUS

PDF

82.5 KB Created: 2021-08-05 08:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15ede9806a88c9bcb0bbced7e2e992ad SHA-1: 558143f0cc7270c911321a95ace2edaf05e95a29 SHA-256: d03501d0e74d05cc8cdee21302ef957ad499b3e60d833b53ed8f9e56c7b33ae1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially malicious URLs. The presence of embedded URLs and the nature of the heuristics suggest this file is part of a phishing or malware distribution campaign, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://chcial.ru/uplcv?utm_term=pals+provider+manual+2019+pdf PDF link annotation
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2d16ae91---93500439342.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210621172241_mnxlij.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/e9e086d7acf311f5ca5b47492581915c/39383437850.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832e7005d23---75325423477.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/8366kcg1fh3e4eup29b5glpja6/88223986827.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1c59e569---19122259896.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071258046e5c---99103370400.pdfIn PDF document text
    • https://telenovella-bg.com/files/34584868610.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/54878968276.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/nen1r7ijnqr0rvnb9gpsnd6g98/77173395993.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8d9bc75671c9c3dd7eb8afe1b587061d/sudizofot.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21375121991.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7beb3628ca---57639051477.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/93359536664.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/50bc2f0a22c2b55c30ad1005ff73f528/19295227667.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8fa2bb3b83f9bfbe784fcd276f2b26ec/57823257974.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/77585113198.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/fekaru.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/63986710634.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/261be03e4745db2002e1872df8031c29/25380636041.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/fegolenu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c3ca24da732b2e17378e4923c5fc7e84/gufesegunosuxupeb.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b28679e6d4---bemipunupubatoko.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/98457704689.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210529084203.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_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 11188 bytes
SHA-256: 7c519e313ddcb0542b110d055ab8bb03d0ee2a1cacb78d2d4f8efef363ffe60b
font_02_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 16612 bytes
SHA-256: edf0343a8bc1f465e0323b4eed031243f1a73743b802160b925030330e56e9dd

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