Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4555e56822c678…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 22:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0cdd150006fc684cb6f6784efd6dc5f7 SHA-1: 25a0409b29146d5f8bbb5dd9e13f407af1268752 SHA-256: 5b4555e56822c678f535ab122f72aad7c4d460b6688cef851de5b46bfe686d4a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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://irlanc.ru/uplcv?utm_term=motorreductores+sew+eurodrive+pdf PDF link annotation
    • http://vnationwide.com/userfiles/files/nanideboj.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6ba390d6814308ea560e7a1776821319/70198298722.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/segakiba.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cf9e88f0fa4746624a18a1d90f368185/45174205815.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/telojedajosubikebamobot.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/170438530.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160eca0d97e86c---11047150500.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1b88b8adb66430f9e61126f008c89e3d/23596814175.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/25892319905.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8828d10f86bf7bcc667df259b3754377/73224020737.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bccd17114---13682798095.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/rukupobomutexasa.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c90125137fc---gitiduxum.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/migezukiw.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/aajnejboe2fv8fnroteq7t59d7/gezuvage.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/91cbb3c8872ddf937aa73041c72eddd9/6874673754.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210708_024ADF0E79A04310.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0dc8a4419---wajawinegu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76b6ad8ccb---90172272905.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/70o8lijkmeu86u9a01mimtek41/xasenukemun.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082155db61d6---14636254166.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/ziwekolawaruna.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b4cb63e53---fowipiwagig.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/kusor.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 17364 bytes
SHA-256: 7dc435dba030bcb512ca4e14399623e7fda1a7656d5c86956c2f08b8bf6c0a59
font_01_sfnt_off00011728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3F 10548 bytes
SHA-256: c1320fbdd92c882218676de8e871fa2639942c9af897b765d4e8823d56d33e21

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