Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bd4628636c579d…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 06:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 642e4adfe6699bc768e3a8adaecff2db SHA-1: 980071207e03d5e110b734cc106bf43950873dee SHA-256: b3bd4628636c579d0223aa335b069b6c861a8e098b3c73d81bf2e1d04f08bd7a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified multiple links to potentially compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs are likely part of a phishing or malware distribution scheme, aiming to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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 http://parmalab.it/userfiles/files/99737811277.pdf In PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/pagef.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219618261510.pdfIn PDF document text
    • http://abnicum.com/files/file/19528300434.pdfIn PDF document text
    • https://hinaweb.com/upload/file/kefubejutagenuvujawa.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/31368221198.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613714cd0e968---86179184396.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/vapipan.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/99689468879.pdfIn PDF document text
    • https://dhesient.com/media/pinorafi.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/8227163250.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210913182923_1993889888.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/s3s3nk418fm4d71c1pij1lqd32/zituvatufalazobipo.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/sosibewevepepuzero.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/3ll89joq91l5ccc7auqhhq1cnp/59154363156.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/75996684992.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/kojolujiloresezazajenik.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210904065303.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/39455399918.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/jizukibafumot.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/kazuzeka.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/58985328441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+tv+box+apps+for+live+tvPDF 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_off0000c22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 16396 bytes
SHA-256: 8ac1d1fc5c548f7627d60290340e1284bbbbb2d257d79bc2353773ba82a8d1f0
font_02_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 10780 bytes
SHA-256: c7444360d9a98687effedf003beedd89c153ac4985999800814b77f879a365c4

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