Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7a91ce95fe60a9…

MALICIOUS

PDF

75.7 KB Created: 2021-09-05 10:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8f1110abb3005916fc80979d7a39d2a SHA-1: 54efa88c2d125e3eaa6899f1f59a1405ec0d7f1c SHA-256: db7a91ce95fe60a990c7ef83027b8d5160ccc89f25809a86c57e79bbe4c5d836
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress sites and potentially malicious PDFs hosted on IP addresses. The document body is obfuscated, but the presence of external URIs and the overall structure suggest a phishing or malware distribution lure, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kapli74.ru/upload_picture/60425020393.pdf In PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/fodinemijodejogif.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d575e9d908c1c05f80e81fa651d93d0e/tavugoda.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/15072126197.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/55975775470.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/29075628447.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1u6sg360u61lv7lc0vknt4vqf0/16130902178.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/7vi5mg8lf7f8ctcpj8rcgmbp7b/64197583391.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/a846ddbbf08797dc0601004f2bfd6389/22285399062.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/68036142340.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/jojufejibubeno.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/sokojenaw.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab679526e---sizakurewatikagijeb.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/patabezetafugu.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5bt4atjmjjurcco91rgeq3074a/zeredokuruvotiro.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/pdeieco0u60qs949s7ujaq1qqo/52126741878.pdfIn PDF document text
    • http://mega.kz/media/upload/files/rejokufizanenasimikevafu.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/50900724233.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/51c38e3a6c960e95afff64ccb195733e/40052715205.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/68627390854.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610bdfa52c5f5---37167762168.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c114a439a8---xuxulaxabemizegudaxo.pdfPDF link annotation
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/db984205e1947285aa4f1be99f8b63ce/96647162267.pdfIn PDF document text
    • http://axwelindia.com/uploads/2570265877.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb6038d46a---beridexanoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=toefl+reading+comprehension+with+answers+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_off0000c2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DB 17060 bytes
SHA-256: 8a6dd2746e0cac6e02497fcbff2f292f71e8c18e8c1139c3067d1de37bf9f180
font_01_sfnt_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 11116 bytes
SHA-256: b2d92ca49609393afc7b9bbdbd1d7ac20fb600e0e72deb68da332f2d9aa3d983