Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5dc3ef4d07b410f…

MALICIOUS

PDF

85.6 KB Created: 2021-07-26 07:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27e04a4537955c38ec034ac7b5d5f22c SHA-1: 250a8e22f8cba4205f516bad05699faf1f627cb0 SHA-256: f5dc3ef4d07b410f0833dd5dbb9bafd9e28eebf0e62c82a421793889e482f14d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external sites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'invoice' and 'callback' lures further indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076203119dd1---kebavefewerajusugixagudo.pdf
    • http://bluefield1966.com/clients/26642/File/18774986091.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccda597a2e---16896642092.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/1e9370ca4d980ee78b7220d67c5c52eb/26137059173.pdf
    • http://hydrem.ru/images/file/97499344818.pdf
    • https://tsegypt.com/file/14964599201.pdf
    • http://goraku-sangyo.com/userfiles/file/98767775143.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/2ba752565509dd2de13e7f840a20508e/24843346682.pdf
    • http://grgct.com/ckfinder/userfiles/files/lidele.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/16278840499.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/da9a3a66e2fba4ccf14e5ffe1f49811e/51109462785.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/6ef87a76c86985bf84874870f7b0017b/53843130150.pdf
    • http://waterreducer.cn/d/files/fuduwo.pdf
    • https://pestresolution.pt/site/upload/file/namumufiwil.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/97297251179.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c825660f8---fixekawisumufape.pdf
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/34235803554.pdf
    • http://crediramasrl.it/public/file/10456002409.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/67f6a944bd8eb5a9e57cc23df8231e6a/59749707009.pdf
    • http://sofia-es.tokyo/yamituki-n/uploads/files/mirafugokadurumomubexus.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/di4hnejum1uidjakieriht68n5/55512180378.pdf
    • http://vimar.ua/userfiles/files/pafilotunijofizib.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/zomegagi.pdf
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/78673954240.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+check+ptcl+bill+status+online
    • http://e1pl2.nazwa.pl/busy/fotki/file/17265719972.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_off0000eada.bin
27a87656364bdf9c677c9098121bcf98ccdf0b3fba2ed1f0ac7455f729ff2f9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 10780 bytes
font_01_sfnt_off0001036f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 16792 bytes
font_02_sfnt_off00011b81.bin
a591118fdf17c6b7408a4ecaf3ec0d414cb9bfe23dc72d5f4ca8511b816d3419
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 17136 bytes