Malicious PDF — malware analysis report

Static analysis result for SHA-256 7358400a77134e27…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 21:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6bc2ce0db2cb94f90fafe7907e958c4 SHA-1: 3bf16be974a329b134762cff1b0a35e9019d444f SHA-256: 7358400a77134e2789a3bea36c79bd04eaed976743b5efe3a63b53bd5c6ca1c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links for SEO manipulation or to distribute malware/phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=all+codes+shindo+life PDF link annotation
    • http://ambcavallon.eu/userfiles/files/52524839060.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/92333860098.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/zigadixudisamazeworosokat.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/bolevivu.pdfIn PDF document text
    • http://flirdining.com/uploads/files/pazepawumedesala.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/fivamipepabudegatitawovi.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/72121357448.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bumit.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210913214827.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/84500930193.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/sefapuw.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc0c31d5a---69972354226.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/bepozixizowonep.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/33556299749.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142c108d02f8---tejigejurosojowi.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/webirixodokim.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/34172959940.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210911_015554.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210916_001729.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/171258561189.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/fomozapebidedemowiloje.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/direrolibatujigefi.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/16adc44f6b520012491cfb5db2f0828b/16393984896.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_off0000cf60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 17904 bytes
SHA-256: 4225988684163bdc23b7f41ca050596948f9fd4be45f7c5d22f25437027714d7
font_02_sfnt_off00011595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11595 10192 bytes
SHA-256: 181f92ad7d64b9ee279e6f3700279969ad2338949e5b1557a72aed7ce25f4a9a