Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e3909596f1206a…

MALICIOUS

PDF

82.5 KB Created: 2021-07-03 10:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cba4629f8a0fc2c7c5594fe6f0e98d27 SHA-1: a8d6909863c5afdd3a17cd829684852053357791 SHA-256: 62e3909596f1206a772a3c6cabdfaf083e353da8f4099ad846c2976522c92ecb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://belgium-ex.com/images/blog//file/waxazavewuturoje.pdf
    • https://ikuseikyokai.jp/ckmedia//files/giwogelapub.pdf
    • http://recviem.ru/img/upload/zijowunuvoguta.pdf
    • http://alexhofford.com/temp/files/file/83128024466.pdf
    • http://adamlegal.com/userfiles/file/58495595591.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3530c50eb2b09000be1025cfa47a45ae/41883740687.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hhdpckmtamtv1qdtcp0tuuk0q3/48148839093.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/iegq914ekr4j51an1bqp5hqi4j/55976573608.pdf
    • https://grandplaza.bg/uploads/assets/file/tefunefigol.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/bbbc0135a23a22341f370b4d87965c55/duxovumitebule.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fad79e866---zifiwazijajita.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/d9cou6odnajjigndnj68ui31hc/79743274721.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b9b1d288---betixazukazekewaxegagif.pdf
    • http://xboxheerlen.nl/userfiles/file/18160158208.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a916804ba73---geleva.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/816bf31ed317da124fe21dff4e69071c/76217485025.pdf
    • http://beautybybelief.com/admin/images/file/54660606485.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/spqmd222o2gobv5r8r2qmuvq50/22007052011.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e1a768b3be22c86d66fb78a80b77b51f/fisaxuri.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f3f9650905d7418159fec6c4a0163398/renanofetidezufuguz.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/28826826356.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/80edd5c6229f3d401e700bcbadfc3d5f/pamixotametinovagidunenap.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=can+i+save+word+document+as+pdf
    • 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_off0000e04f.bin
637fe0ede5e2c7436ce15334e975c4c67c08bc26d1e974a6fea641a233b8df7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE04F 16496 bytes
font_01_sfnt_off00010b4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 16792 bytes
font_02_sfnt_off00012361.bin
0aed01e8561e90442a6c65932ed4e14a0569d91c09d6b745dfc7a37a9124c563
pdf-font-stream PDF embedded font (sfnt) at offset 0x12361 11016 bytes