Malicious PDF — malware analysis report

Static analysis result for SHA-256 e318f7578f687785…

MALICIOUS

PDF

93.5 KB Created: 2021-08-09 22:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31cc17f88e3d0a2ca8890873c87f7e0b SHA-1: 6fda466791ab7a2342b5193f0b748f14b85b515e SHA-256: e318f7578f687785c5f617664207e91367c6fcb4f5215d2e39386bfacf85e0d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that this PDF is designed to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/01bcd648c351e6e9f658dfbf8a17d2cc/kudot.pdf In PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084188e8d2fb---50222935841.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608316c976cf1---26981777526.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/suroxokudomedoriwomuvawaz.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e34a91776c206f6a088294e2c1603857/juvemubovofuxosiwezuj.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/mosugaxifevefefodure.pdfIn PDF document text
    • https://synersys.fr/contenu/file/rivozude.pdfIn PDF document text
    • http://bjjiffy.com/upload/mogepapibawoluluvamo.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/golilam.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160f4173f5364a---xipebomosaguwixa.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/l2cid7qco9kdk94surg48ceut1/sijiso.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a937c16aa7d---37815860911.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/gusetowul.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/juletesutagodagari.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2aa7e709a---rutunipulipevarelimijefu.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/98751847845.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4cddde655e29e9a9b28db06716636a4f/86732092785.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/2333338752.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/pidofudogazebuzu.pdfIn PDF document text
    • http://sam-global.info/files/file/66010842856.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d93a22e82fe---54809635218.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/enbfp05enbf8at9go3pr3aq9t2/rojolarasep.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/4644876685.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/mugatipopewunusobarik.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/97cc1a46612610f91570697aec5a00d8/31287255230.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/vagugeramawedijurafem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+wi-fi+sidejackingPDF 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_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 11176 bytes
SHA-256: 9ca938f4f77d8677c7b022a794a17e68e09950306abfaa311617f8a9a9cee2dc
font_01_sfnt_off00011445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 23100 bytes
SHA-256: a0dfed2fc049e963c8dfcbbd6ed0aad5a61fb4c215fa328eed824a4f431608e6
font_02_sfnt_off00014d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1