Malicious PDF — malware analysis report

Static analysis result for SHA-256 45735e527c3d68a1…

MALICIOUS

PDF

89.9 KB Created: 2021-06-28 19:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a599fae8b3892609335506b1eeeb1a7d SHA-1: 29632f61af026e02b316a27bebee883c9ad18421 SHA-256: 45735e527c3d68a1a4ef7329195f2723f2a92f8d1fb62ef1890cd748a31ff4d2
176 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number, a common tactic in callback phishing and tech-support scams. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used to distribute malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 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.
  • 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://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/3c37571e3dbb001b5fde75c5eec7129b/11241321565.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b241e0e606f---mizowiludit.pdf
    • http://kmkonsult.cz/userfiles/file/58040325735.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789c4c95256---51526053565.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbb7ab12f4---gekadixugot.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160773a65dc0dc---pijimafitokabubaj.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/66046627.pdf
    • http://lungshingcentre.com/userfiles/98855971860.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/977fsk6b1deke31ji2tscbvhdo/bofun.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ddb945758---tuluniduxezazadamamu.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba367b791---somupuvumararidiparuzu.pdf
    • http://projecthouse.bg/uploads/CKfinder/files/xejeketijukelevelel.pdf
    • http://animationcoach.com/userfiles/file/39430630304.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/6504f46c50a0fb2aeecdd6779fc69782/81938270608.pdf
    • http://work4shop.cz/userfiles/file/76520641793.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bbef23ba4---56909975007.pdf
    • https://2acontractor.it/images/file/ridifuvegemugejopefaver.pdf
    • http://www.aluvascientific.com/UserFiles/file/93551517833.pdf
    • http://isgsrl.it/images/file/22569264456.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/65ac30d5d42c8e5ee1764101c5519354/lemibinomemavofon.pdf
    • http://stoewebdesign.no/userfiles/file/nutox.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/d7aed0ec3cf3b2e4ad48a12d4e431669/75796470261.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30d78a6bb---jumisirugewedo.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/900737ba831c887619d61d219bce2c76/balafixizaxo.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56012d28b8---nolivopejudotuxefobato.pdf
    • http://ristoranteyuri2.com/userfiles/file/71112590522.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+add+drm+music+to+imovie+on+iphone
    • 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_off0000fa8d.bin
9682a07725bdd400726d4a05ad9c7164a6af0e9529072e9a38dede24852e1daa
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 10976 bytes
font_01_sfnt_off000113e2.bin
a1cc8f809b0e9a293432179634ceee9641be827f0037b08996d09318b8214743
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 17096 bytes
font_02_sfnt_off00014053.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14053 16792 bytes