Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5e42736f1a5356…

MALICIOUS

PDF

80.5 KB Created: 2021-10-14 00:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0ad36c8a355183bee56ba8ecdacbe979 SHA-1: 7169f19ab326c67b2bef1d6bc2c99082ab7486ce SHA-256: 9c5e42736f1a53566fc961dca5b29d457d5bbf1e0d38cd6d84eb6a7f81854ae5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns suggest it is designed to lure users to potentially malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://stepweystudy.com/ckfinder/userfiles/files/79825383250.pdf In PDF document text
    • http://nazycakes.com/userfiles/file/xulabagizu.pdfIn PDF document text
    • http://cheapstandard.com/uploads/files/95942777033.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/mukivuwamozesajukixidelif.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/94493419745.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/2381774077.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/21705249164.pdfIn PDF document text
    • http://rc-modeller.se/images/file///95006972428.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210930224511_rw3xxb.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/lezugixoreponu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea32b4ef0---83729954867.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/40427128468.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e58a35103---libora.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/10538380844.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/98847307758.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/jomegonukizarizotog.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9199acb11---46457972491.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/44665641173.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/wofevesijireluwuj.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/39874391677.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/63804508600.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161bc05cb1f1---2214296056.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/34999244611.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/41513541667.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=bible+spot+the+difference+printablePDF 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_off0000d50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 18196 bytes
SHA-256: cb0034150195728d9c2a8d4fbe76b24eafda559049d49c03638bf541f414214a
font_02_sfnt_off00011b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9E 10912 bytes
SHA-256: 926fd7b2d9fa6498f681acc24f278ec4a007a472850f03411457ed8f9d818e41