Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af3a7a8f96f079a…

MALICIOUS

PDF

109.0 KB Created: 2021-07-07 23:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a35426c96688280d82617c23d9766cd SHA-1: 1754e59ad894212439d1fefd6d32ec9d8e05e8c2 SHA-256: 4af3a7a8f96f079ae7d1f3249aa27f86285ede92547d49490d48826a1ed7fd40
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports the phishing attempt, likely to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=a+textbook+of+pharmaceutical+chemistry+by+jayashree+ghosh+free+download
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607904e9797ad---migesumikurinurejosilakem.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9ae8b03dd8a7c3ffc9e8a13fbd33a63d/xesivigifudokad.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/f611b239577bb26be5593e24055daaf8/58589767190.pdf
    • https://aashianarealty.com/file/72542150346.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jaziwanuzatujulegubepopi.pdf
    • http://pwr-tech.ru/userfiles/file/pezagari.pdf
    • https://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/58741339417.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/84440744889.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/4fb3ca1f25ba11236799c5b6604c1cd6/tipem.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99609745f3---73299030992.pdf
    • http://amandatravel.com/userfiles/file/bafufe.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a12202d92a0---77758218750.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/69282199694.pdf
    • http://aaaexpressheating.com/userfiles/file/lidisezapivijukuvufajewu.pdf
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/ligeranolilag.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608766ee635d3---97607845271.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/xuzidupiwimigifaf.pdf
    • http://chikatere.com/Upload/files/lowilaso.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e991336216---9140625609.pdf
    • http://malbreil.com/userfiles/file/gemopubufidusepezoxasowex.pdf
    • http://www.golfusa.be/userfiles/files/lasuvikodu.pdf
    • http://poltinik.ru/userfiles/file/gefukigovadodixoger.pdf
    • http://absolutelyneon.com/userfiles/file/47452470969.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28dd42ec7---tususopafusajavisovu.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c0cf20648---94268509686.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/948a0f9afb9332f1e1dc9066921c824f/zesutigijepuvixuxufepez.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba54abdff80---56040926646.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_off00014500.bin
3d8cf7c001b9c57ce702e700e72809061dd5e1ef39546da8039e33a2a8172467
pdf-font-stream PDF embedded font (sfnt) at offset 0x14500 17196 bytes
font_01_sfnt_off000171de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x171DE 16792 bytes
font_02_sfnt_off000189f5.bin
c5a213cc4d1f04d51155c3325d7b5dbb0c198f42ba294d67d1f471d9e7c1b5c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x189F5 11812 bytes