Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e39166034544314…

MALICIOUS

PDF

91.2 KB Created: 2021-07-08 13:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b30d77ae9ae186e053ba89ffa3e83520 SHA-1: 1eed76ad9481872d23169e349c310f41cf06ab0c SHA-256: 0e391660345443143867a6709a53fc2f37fa2792a96e602a6876b247fcd90671
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the PDF structure and embedded URLs.

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://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2a099fd46510be3e0522d935e13beadb/perafagudedul.pdf In PDF document text
    • https://ev-owners.jp/userfiles//files/zekifamisakaw.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/47487972033.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/94527687847.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a40bac069---54279364137.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/74799632468.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/22495748164.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1465982b01306cc96112b70bd2191f7f/73391716438.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ee7ce93b---9625940069.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ptb561u3l24om7i4837gfjk8sh/juzuti.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b574ec14744---gozarigipobovute.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/labixaredokofinulugebem.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/949a12e90a459c0f3022d339d8090ccf/sowitagezi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d584d220a---luxuzirukizefu.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/93deafcf847f81175994522452206292/zunubedokerosap.pdfIn PDF document text
    • https://unosms.us/userfiles/file/tigisimofisoxisebawe.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa89d691254---duzenefirudunorilo.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/kolozesovuwefunokaju.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/41427993502.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/kadekirakirajaxeba.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d186ec40897---35614649026.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/63563621825.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/88386153882.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/30113fc4d7e06fe966953e2f8c12c076/xutoramojasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=move+buildings+stardew+valleyPDF 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_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 10920 bytes
SHA-256: a4d0408716cddc6fd7c36ca19f523bc3353461bd67a466de481085ed88e217ad
font_01_sfnt_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 16852 bytes
SHA-256: c018992fc8b9917758a4652ec8045967ee0b147009da25d7f43c236e67c869d9
font_02_sfnt_off0001475c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1