Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bdcce30768d972b…

MALICIOUS

PDF

85.9 KB Created: 2021-08-16 02:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d76092cbb1e7229024d6834f740fc34a SHA-1: 1aef6e4bdf8d418146f693b88c8691a064eb40ca SHA-256: 0bdcce30768d972b385345f6ed3dcfddb13a798d70963cf68011e0b7253810fb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to various PDF files hosted on potentially compromised websites or disposable domains, suggesting an attempt to distribute malicious content or phish for information. The presence of a callback lure heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://446888.top/userfiles/file/33614972648.pdf In PDF document text
    • http://shinies.ru/img/lib/file/9471663287.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c5d72373ca9d544612c2555627a530e/jemaxuxibudikip.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/hn0amjp8grvqrlnca36unucr77/xirokasovupenijotutixip.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/tadofiwasajarofaru.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/39704479656.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/41tv8rn63bke6iq9tik3l3fn5l/47687196360.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f21dfac063---sodiminugofezewidez.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/newetitojikajozani.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc947bf2a9---dojikikewapikizebav.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/finagiwukaso.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f16fee235bfbbf3d9adf742f0b64580f/43144878031.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/nubotovedakepumedu.pdfIn PDF document text
    • http://grotech.in/userfiles/file/95112289396.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/71455633343.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/7953318452.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/woparanibesogezubeka.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/16785557017.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1baee39714---benab.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/18217001795.pdfIn PDF document text
    • http://socialsipahi.in/assets/ckfinder/core/connector/php/uploads/files/53699829010.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/78698388174.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/nulaxojakomakajade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=burger+king+coupons+september+2020+pdfPDF 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_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 17812 bytes
SHA-256: a19caf4b1ae5596a67d8fea0c3f2be12aa602dd2718f9c00be90cdb0fa26f37f
font_02_sfnt_off00012f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4F 11380 bytes
SHA-256: 3ffebc13b9a648c42a5f9a364dae1b7ddf0183c687284e3b0c17a3b8e1c63b86

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