Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4b31626450d99f…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 02:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8aba4f8b8d7cb5535b45f18f9d5c432 SHA-1: 497541081f01a3f2cff84360c4424d95abbc3760 SHA-256: 7b4b31626450d99fb76a472cdcd635f1feb273199b066a19caf910ebccecfe5e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3f70ca68f---81434054344.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8553ad1072---banulefivuxejibejipo.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160942004bd3e5---xopisimerafadifadit.pdf
    • http://www.yevres.fr/ckfinder/userfiles/files/pupak.pdf
    • https://fa-vietnam.com/webroot/img/files/88460733656.pdf
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/60204591215.pdf
    • https://medsplus.us/admin/images/file/70729038036.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e68836046---zirotunuxapimuturaxupe.pdf
    • https://oklogistic.lv/upload/file/tapotumu.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4f253abb10e555ee650b810eeb266fa5/24191553466.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ng6ai75blftt2380abnaqck376/21021900565.pdf
    • https://stalbeckers.nl/userfiles/image/file/julaw.pdf
    • http://panziofabian.hu/fck_kepek/96460276074.pdf
    • http://doer-sh.com/Uploadfiles/files/motelagewon.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0495ba7bf7a23b9c89a1c5d5a9e7aed/27108973159.pdf
    • http://graham1978.com/clients/79565/File/63604387287.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3fdacd3ee---73825802995.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d2f10d2da---modasivitajos.pdf
    • https://idosekotthonaveresegyhaz.hu/files/files/16196927131.pdf
    • http://daonshop.com/files/fckeditor/file/salulatagosomuzikezoxu.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072309ae960c---moxexelisufo.pdf
    • http://bidmitt.com/img/files/file/defiwunapoxetefanugu.pdf
    • http://briquettemachinery.com/d/files/41803950909.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/51172431118.pdf
    • http://bpabv.nl/uploadfiles/file/fovotevapokosekoxo.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/5144606423.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=girl+names+in+bible+starting+with+j
    • 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_off0000c69f.bin
b5184b2cf29409739fc1c1332b7dcae404507e636d07a2dca1605fcf914ae45c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC69F 16992 bytes
font_01_sfnt_off0000f1a5.bin
cfc36864fa03c9cfcd62c59660b06bfe1538152ee9784dd3d9c8f67f3389340d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 10828 bytes
font_02_sfnt_off00010a7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 16792 bytes