Malicious PDF — malware analysis report

Static analysis result for SHA-256 59fbc6e997c639b8…

MALICIOUS

PDF

136.6 KB Created: 2021-07-31 05:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40b7e9c4a0df23034d491eafbd0c6855 SHA-1: 5c4fccf705c9b1b769c78bd46b20598ab69f6d60 SHA-256: 59fbc6e997c639b8dab17c6983c9a819eee2adbd85d0d4b7079a27656041ce89
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability or serves a malicious purpose. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. No scripts were extracted from this sample, but the structure and URL patterns are consistent with malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/e36d3a8f86c3fe84b94846840df0de1e/mofokadubedidugonujivonuw.pdf In PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3dd1c2c2d8a113cfd730347dfac1cae2/46932952880.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/642af1ce326dfd3b209cc68a81c3ae29/42123583346.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/585447122c74b5410c9803dc5e04008f/nizil.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/gudedoxa.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210603_C3DD94FB978C94CE.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b58545d59af---futivinudijegega.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/votedajejurixinisonoluw.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/27928447841.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0228725db---28529398804.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5e42871e0---4378124456.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/67428329698.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/sonuvi.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/kavatogenuxe.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/70169304695.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/52503be0305dce07a54d41d64582b9d3/28511194411.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6og7p0jfhd0a16feopr8ot9lb5/lenegozoguxudimaler.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tudewe.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/47510768819.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/tifaso.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/81226063759.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc42894a4a---ziduxosaruful.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/16300848552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=strongs+concordance+number+334PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19268 11140 bytes
SHA-256: 3a208977ac8d5ec78e2563290cdb8e98fba9bf0a60ce9ec215ab26bee934a61e
font_01_sfnt_off0001ac4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC4A 18032 bytes
SHA-256: 21558e71f685cd51ac240a6d48c606a2828c0b7b66a83353fc72c78f6e70cd30
font_02_sfnt_off0001dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC29 18356 bytes
SHA-256: f9f0fe5788589220da88d35cf21cc8d4ed8bfffc112614dadfb9fcf4b4f8f62f
font_03_sfnt_off0001f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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