Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31b5db6044eaa08…

MALICIOUS

PDF

100.6 KB Created: 2021-06-28 11:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 28462372d460603e4cb53d8495104b3e SHA-1: bf2b4931e4ce25a6e659dc6dd5a1d49f762c40f5 SHA-256: f31b5db6044eaa08d776f643819b4b6874e9c85d3017332b959b4c9d175b1682
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads. The PDF's structure and embedded links suggest it is designed to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://restravel.ru/ckfinder/userfiles/files/woloxoriwufidewawuzafemi.pdf In PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/105819cbffe9adc309e6da322b895f01/xopazegojasifiw.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc48c9a2f7---81533386910.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/34049784420.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808267543fd---58531074236.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a3879435cb5c4c1bc3f452593705f99d/4786217799.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7282e24d---41973973073.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/gapavuxawutejat.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb9172d457---dajukin.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abde863cc48---9701173457.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091c2eb3bb7f---dopirex.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d7c2acc7---55367228931.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/pedatakadesexolatit.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/kepigoxuwo.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ibiitc14jj4rrre04l2ca2st57/sokorinobogufupal.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/51363818640.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6228a0e361a898fdbc6f0ebdb384a22c/74499790096.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c1f61d44294c95e383de8e68fa5ea977/19202448359.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/76525018424.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/poloda.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba667b137c3---genazixilerarudigimefu.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/namapisitesavetijir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=velocity+and+acceleration+lab+activity+answer+keyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 17692 bytes
SHA-256: b33c444eb95e40adf2ba9e556f3b778d98d34862986ef80bd62edf27a0160acc
font_01_sfnt_off000151d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000169e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E7 10828 bytes
SHA-256: e8ee1c3e68ec25cc9a76d6baaf4717b219e1b470b117cc272648711a3ab64694

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