Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93830a638772312…

MALICIOUS

PDF

70.9 KB Created: 2021-07-01 23:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-13
MD5: 0e8b1fa87b3fc63d0535f2bf45efcdec SHA-1: 9c8327e66462b440812369a475f8e617c9ccd0ab SHA-256: c93830a6387723127f0bd1eff3e3f7e6b973081269eed41e23a6386e66693bd3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://4bx.pl/public/file/gezufamajaro.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/352r3ll6dka4hv3g5vqkfhk13o/zofubil.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/00a575304960e287669e304f28df8bea/lugenalagejila.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a3e2a151cae5ea0645a3e9a90a92c582/sufefox.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872c1ea2740---buvimazodepuvifadizariki.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/fuwikujebatanudoguf.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/10a1d0752c45d24d8e099b99c8564af1/lapufuwofuvol.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vesanonezimeboxu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b386d1984---topanijexiked.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/73297247479.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c8d1ca0da---nomefibunafobi.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/aajjfdca71f09462hvuo9vuabl/89245441145.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1102412378---xodagovefolonotorufizute.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/72e44b248dde2c4a4af485de6cb0fb34/43509196555.pdfIn PDF document text
    • http://prosquash.by/data/62975035864.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/tejoxovidimoro.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2lkkn3eai4p0ktcc926fq3ipfb/52606945167.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/18904662355.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ae9e29e23db50a5948a4ae381b97c8e6/56171818312.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6f430b2bd71043292e708bea26534395/tosinujusovuzepokemifil.pdfIn PDF document text
    • https://aashianarealty.com/file/nagovidabakiwixa.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/de9b50ecfdc435733ffadc15149f3fe9/35633952181.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/vemazagovisiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dawn+to+dayPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03B 9904 bytes
SHA-256: 545bb939221543369f83a4208a740ab57372eac2b9198e9f3e684ee1bcc3df95
font_02_sfnt_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 15336 bytes
SHA-256: 5afc6f94bc17d3dcd4f9153ffcc652f46d6e6a0ad2aaf30459c5d7e99a217f79

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