Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ab61bd0e09c711…

MALICIOUS

PDF

81.0 KB Created: 2021-06-28 02:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0ae698dc40b7cfeec42c60b1858cf64 SHA-1: fdb05e588a72b51396dfcc7da18424f1758e6bf5 SHA-256: f1ab61bd0e09c711edfb40e26a4d5b3cc87fc94a6b779924a0fda59178868ddd
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised websites. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic to obscure the true destination or spread malicious content across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/59b33cbba51137c2c355584d25510944/bubuf.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a6100a012714dbdb07627f5d959760b4/73153615796.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608323e2b9a69---36883273612.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/e3fe6ee972feb507af908335102f3c12/gonepemabijewesiz.pdf
    • http://cesurmakina.com/userfiles/file/boxebuxovaxudoxadoliso.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210601_67A2FD1C89A71294.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9dced393d20c3cc1629564c5f792f297/zidajewadinupulu.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16083f86fe950a---guxuxo.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607035914e79f---votikaxej.pdf
    • http://uamarkets.com/images/file/ravufosopadaboseg.pdf
    • https://mimpishio1bet.com/contents//files/xelone.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771333f37c4---69728559108.pdf
    • http://kaies.cn/upfiles/file/vuwojafoturevaj.pdf
    • http://oldtimerclub-thueringerberg.at/images/file/30303267567.pdf
    • https://etadelloro.it/images/file/85422467980.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/2v4v53uf65gamn0fajg866s2r5/48337158882.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/6668604976.pdf
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/keludirisimijuzu.pdf
    • http://ihdbd.org/upload/files/losizefu.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f5a5e68f6eb7cc1de429ca2f33eda686/kifagovafig.pdf
    • http://apsencollege.org/test/fckeditor/file/42799971131.pdf
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/nikoxetosudasu.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609082929aabc---vetifagaxux.pdf
    • http://www.urbanwaterways.info/files/4056014484.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=meadow+williams+den+of+thieves
    • 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_off0000d9b3.bin
6992746d17333a185b64d926b42bf9c93a00296512eab0f72ec99d8f88079624
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 17060 bytes
font_01_sfnt_off00010660.bin
c4f70554764e12651af1b23475b64ce56c7178beb6ed7e83fb745241d689a3a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 10664 bytes
font_02_sfnt_off00011ea1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA1 16792 bytes