Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a207d269f6c8899…

MALICIOUS

PDF

90.4 KB Created: 2021-08-07 09:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77763f0495b3b5bf246119f2f57710c7 SHA-1: 4eeeecbb2508da002156fd59c610304a14dad1b2 SHA-256: 1a207d269f6c88998ea1f1f48d508663fb6986462ee16c47dc4723da8870e801
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/73150fe997bbcd9e157a8e020e8b33a9/vedekexu.pdf In PDF document text
    • http://podlahypilat.cz/admin/file/44046655227.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/c935c95573fb45e11ac9c548803d6eb0/56080898415.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bndf0pklnnlrae099a4b7dmcc0/55328850591.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/natabuzolumumuvutuf.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/7918929c26f5a6d9373d8ac80968ef03/75991820533.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/91487298965.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/puguxemewolenawerij.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cea2c126fe---58890851599.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/73914826291.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/wituzudalum.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/46706481698.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/getudusaxupafu.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/xurofo.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/bofoxolajisolavot.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210806134153.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/xotigami.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/mtq9u9ojsvqdkv09kh31pfdb67/majafevemakifefex.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/revibasodu.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///worab.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18ba2bde3---peritipazolojupukadowunom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=honey+bee+queen+rearing+methods+pdfPDF 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_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 11388 bytes
SHA-256: b62f2a77e21c04cc3ef71a7f3cb485fd3ca8460daa641de3cdf1ac0bc8a8ea80
font_01_sfnt_off000115c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD6 17408 bytes
SHA-256: 9c30ff134785f87c2fc706638041f5d37c28f265bc962915858737252dde57f0