Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3460e57b3a678d8…

MALICIOUS

PDF

92.5 KB Created: 2021-07-01 10:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dae56c00602bed97e94e17acccaa7677 SHA-1: 7925a1497abb7c968c48061ee15e8e5fc335aae3 SHA-256: d3460e57b3a678d83c7ccbf452a6c32e67b15ee75c69fe390d98b8a8bd90027f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. No scripts were extracted, but the presence of numerous external links indicates a likely phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77305b4b92---xegorimutudif.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/r0t6sqphnttvf06rk540kvbt8b/89053677660.pdf
    • https://technische-dokumentation-hoffmann.com/upload/files/10167471871.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725170dfe4e---ditojexuzod.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/jhojnsbk8989mcqu32rq2mnug5/52808709237.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8da799c75efaa26e36d8ce388f60efd1/bukujuteg.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jifufakonaj.pdf
    • http://colorfulmedia.de/fotki/fotki/file/81335678731.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/m2mtubb5t62gtc757un9061b7r/niporigewokibe.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/1620230062267.pdf
    • https://zlatartopalovic.rs//files/xegex.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b0be5940b---sazavodomevezolizuremi.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db624e4db8---kivaludatikovod.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946d7e38103---9484615788.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/b7cihbcn1vkrpkopk2lcjhgbf0/todidezatefuxobek.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af968b19d05---26198542912.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-6-18/20210618160146912785.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d22750cbe76---zudokopefilofa.pdf
    • http://barudan.hk/UploadFile/file/20210616055126232.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/7b50c04063b5dc13456fc78c84c26286/lapopupevi.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/lawogu.pdf
    • https://sealskinz.ru/files/file/togixidotagefedojodobup.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835d57340ee---jegezobarifibin.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=spartacus+blood+and+sand+ilithyia
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 16792 bytes
font_01_sfnt_off00011f02.bin
29f8f9236c5ccc1fb7a23da59cb087c6ff33ecfd7a81cd6892ce05c4054e5ac2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 10908 bytes
font_02_sfnt_off000137e6.bin
de41059abc6b495e457afbd853a0e531f466863cfd9b8ce59a7aaa48208d1c3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x137E6 17364 bytes