Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b88a25eb355b48…

MALICIOUS

PDF

95.5 KB Created: 2021-07-02 06:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a2c222093dc42e964e3c038d7e3e832 SHA-1: 6363113418073cb2eef37ba6bc75fdddf38a570a SHA-256: 98b88a25eb355b4809e9b4dc53c0700046ad7a775e807af2bbf9257d08b46d64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://a-1commercialkitchenservices.com/ckfinder/userfiles/files/83776694837.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075eee8cceef---8210222824.pdf
    • https://loctra.net/userfiles/file/88521740252.pdf
    • https://ntct.dz/ckfinder/userfiles/files/37444143725.pdf
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/94036878152.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6d1213a458bf40b5adf8dbcd2e37d8c2/fovopibuvezegel.pdf
    • http://sva-jeanroze.com/xmedia/file/51220941267.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4472838cc7---11103469423.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ffa7c2ee46ab90f352ac7dbda6fde73/93705282235.pdf
    • http://beveragesgs.com/userfiles/file/muzenoroxiwawogiluma.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e5479301a---gazofitetepisaruzi.pdf
    • http://bindashnews.com/userfiles/file/vabajefiw.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/fozusinujutasekadejoz.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2062a9f69---vonapajoxekijefi.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/lasapiboverefumumas.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/79151506183.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/af1up0na8t1lbhig1ls8g2cfq1/37643449691.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ee7f4947ac383687008952188446b6c/mafiwederazabalewaze.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e451d3892b---58698534292.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160708f89882df---21451238922.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/645e9bcdf98305d72755640e4b097aac/furojufozoruxomeku.pdf
    • http://jnnycc.org/userfiles/file/wumavatakusufeb.pdf
    • http://thomasbelldescendants.com/clients/40432/File/xawamepajuz.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/67085334a06da3d0f5ed4af9458deb62/dasodewefimumimoj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=part+time+benefits
    • 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_off000113ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 16792 bytes
font_01_sfnt_off00012bc2.bin
59e4680d689071f839cf28e8f1e507558169e70cb923b0afbcb944c066badb6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC2 10348 bytes
font_02_sfnt_off0001431d.bin
8fdefeca7ce44997485efa45668d2db579fa10be02740a8a45a8e416e5c5be9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1431D 17472 bytes