Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7aedb5dca0a6e0d…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 04:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e09bce9b5d45e50bbd10d795bbe9970 SHA-1: 312f15b556cc565141c64a03daf60e1228521543 SHA-256: e7aedb5dca0a6e0d0fc6c2a0e710baf2140fc3197c6990213a4a40497cde8df8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=open+my+phone+memory PDF link annotation
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8ebf9b4ef8ef8f4ffde0689ac4e9b210/vamupe.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/72480828984.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdaf48e800---15458839599.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613448fedbfd0---bebinotififid.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///70561699969.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/vurarefejal.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/81382302892.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/zovegujariro.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/58670248190.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210906162033_2062480591.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/52076668309.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613006e0e7215---vowinenixewujelujepa.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/5036259351.pdfIn PDF document text
    • http://skia22.ru/pic/file/legexa.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/14638981132.pdfIn PDF document text
    • http://unsersohn.ch/images/file/25505335352.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/magedoremete.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/sojunisakuxudegebijuta.pdfIn PDF document text
    • http://parfumland.sk/upl/zepuraweridujepalijalise.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/zubibumirabevifadob.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/nibupe.pdfIn PDF document text
    • http://abwrva.com/uploads/files/19042266261.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/verujidodifojekudo.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/32211427480.pdfIn PDF document text
    • http://regiapart.si/uporabnik/file/ziduzifofizovogafi.pdfIn PDF document text
    • 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_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 18648 bytes
SHA-256: 1df06fcb7feb7c6155ea30ea22c4f72784571d01072b8354d4530bb68efa5bcd
font_01_sfnt_off0001177a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F91 10088 bytes
SHA-256: f292a4fa62a0a29dc48bc6a9106224e1a868cfc9e9970c88fcc043b67ae81a4d