Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f38ca7dec0dd40…

MALICIOUS

PDF

140.7 KB Created: 2021-09-08 03:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7cbbe0acdf84cbab16fc9db6030a3abb SHA-1: 61ab2b5a3e0a12c04aa241acd4a0a5a1b4893998 SHA-256: 17f38ca7dec0dd40da776de62d72602ecd080cf71be464d9386e4b3ed7227be0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or distributing further malware. The presence of external URI heuristics further supports the malicious nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://ketchas.ru/uplcv?utm_term=investor+relations+guide+pdf PDF link annotation
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825b27be92c---88568016411.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/gefolomeduduguza.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/fibalagubumolis.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/bojumovuzuribafowixusi.pdfIn PDF document text
    • https://drsaman.com/files/32499086158.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/39637976078.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/goxufuziwiko.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/sediwozilumizomub.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3m08kr8sktngs7j7ke6ccj6mf3/tonodojubugixibo.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/10f0fd8f426839d4bcd5a896c755c38f/fujederinebil.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160731c78567f3---19391840545.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613382fde2255---jovowuvikeligedakasev.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/miruxilumuwoxug.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e50ee3d7c---dezepanumapokaw.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/21808247329.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d640d1b9541---53182494994.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2f76e4e77ec7bb16ea8ab4507aa9844d/31088856485.pdfIn PDF document text
    • https://strechybenesov.cz/content/kesosujomegufez.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/22327826310.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/lewotusenatikejogulod.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a185679c517---kadoxuziwigebot.pdfIn PDF document text
    • http://sb-78.ru/files/file/28726761430.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/28806110242.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/smqp32d9qal78gk0nvr6hs9qf3/taxilanoferux.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160864ea2cc4de---31343182103.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0ab4bfb6f---35632310638.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_off0001bf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF56 10792 bytes
SHA-256: ef06d70588f0247c43eff04ff45569a71c530184b7662b1386a37e40e6bee856
font_01_sfnt_off0001d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D81C 19904 bytes
SHA-256: 97714eb15c13d2480c6ef988688eed9edfc262aefda43723a242819f8600d423
font_02_sfnt_off00020c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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