Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdf5c3e1119e26a…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 05:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5bf5bb8d5d2753faee71671559c4eb16 SHA-1: 5c8de1da17663c6a8a8db1c5a440bf66bccb08dd SHA-256: 8bdf5c3e1119e26a9732bff7b2b652ff2e34028e5db8b3029d8ca5afc2214d5e
196 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the presence of link farms pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=find+icons+android PDF link annotation
    • http://cjmfgx.morefriendship.com/upload/files/66398396263.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/83568157453.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/58265283316.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/2795737635.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/lezaraniw.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/aab3c8603c99a1a2255917d681eae71e/717299784.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/rizopezabatiji.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/10492106266.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/3280b349ea13a67fadc8ae5202805751/58886811285.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faadde1937---fuladorige.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210929/file/36448224743.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/bimuveduvonikiragotirigu.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/43295908399.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/dapozojinege.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466d079309a---56687964884.pdfIn PDF document text
    • http://apicn.net/upload/files/bokiwuxoxujofuriso.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/dejinosolejimowo.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/jogelifelabifimiki.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/61059833680.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109032357152865.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/99556212125.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/45875116891.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_off0000b375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB375 10064 bytes
SHA-256: 72af6267b495750ebd5029e2bd7cd28a5f37d1a9dc75c5c5576db6bf86b8d7e3
font_01_sfnt_off0000c9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 17832 bytes
SHA-256: ea541008a029ec16939da024f78965e7596aa31eeee6690ebea765884b64b9a0
font_02_sfnt_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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