Malicious PDF — malware analysis report

Static analysis result for SHA-256 53716b414db5e9b8…

MALICIOUS

PDF

120.8 KB Created: 2021-06-27 14:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c7372a1e8a68624978681ca3c9738df SHA-1: 1d22f23bfbcd2816d18139e5094ff7d5fbc52e5e SHA-256: 53716b414db5e9b87c2d90b9e979396e4b01f6233a5b619d16c36ad032a50491
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into revealing recovery secrets or private keys. The presence of numerous links to potentially compromised WordPress sites and disposable hosting further supports a phishing or scamming operation. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving social engineering to obtain sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 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://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/032adca38befc90b50fef2280c822210/wupajilivolanudupevi.pdf
    • http://mojahotels.com/ckfinder/userfiles/files/fuxivumufapux.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbda83c5c83---wofabokabitajir.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2632de4f4306159af61a88699c039c3d/71495270626.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d09d67a16---96718500226.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160716b2af3669---jumiloruwofagepij.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3131f2b174---nibatosejokolemivemusole.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6b52573e---71174524089.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/qfmek9faomou3ojtgsl67mfqh5/vovawebisurodixo.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83462799708.pdf
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/xaworaxugutuwimipoxenise.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c52b2a9242---37708281270.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/51d3720140646c2750f870389603100c/97667443701.pdf
    • http://almar-bus.pl/userfiles/file/77098136968.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608180e1a9300---pejoduwatevog.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22a82a2c8a---58742740221.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6879b0a03a---duxizokojapapanunufakuwa.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/45038047504.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7951f7eedf---napavama.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160810797de19e---zimirulego.pdf
    • http://netinflux.net/userfiles/file/bimazo.pdf
    • http://velo.hu/UserFiles//file/49776381043.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/97edfbf1f896cf65d13cc5e8dcfeb4ee/84851629824.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=insist+in+doing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001780c.bin
f620375e89a2468ca264030addb6ec89b0f8120962a49f3586c4d1ec749052d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1780C 17880 bytes
font_01_sfnt_off0001a6ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6CE 16792 bytes
font_02_sfnt_off0001bee4.bin
fcb0c59c33eca70e4f5684070ad693ca50564538533698a44f6d22ccf6159568
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEE4 9936 bytes