Malicious PDF — malware analysis report

Static analysis result for SHA-256 169f85b6e8afe0bd…

MALICIOUS

PDF

85.1 KB Created: 2021-06-25 13:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c128e604dfedd19ac723fd906ae08ab7 SHA-1: 8bc7134feab5594060b2401572f37d5cefe980a3 SHA-256: 169f85b6e8afe0bd1a91e8744f6003b73cfd1130ac9b35697ca1edf2c6f57d8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on disposable or compromised domains. The presence of numerous embedded URLs, many pointing to potentially malicious content, strongly suggests an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://hansenlight.com/UploadFile/files/19606647000.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c944102a88b---xilofavemusudenefa.pdf
    • https://planet-for-events.de/userfiles/file/xebebedaz.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/kp3pjtr6jn1t90jdmc73q40pcq/96573071043.pdf
    • http://bebelino.ru/userfiles/file/15285729389.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/nofj996o48a7m0nqngijv3042a/nerejuv.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89598230c---fimiroluzivos.pdf
    • http://kojeneckezbozi.eu/userfiles/file/58241777654.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755170a7819---28591218941.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4439909393---zexunomuxizeberodu.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/69558bc3bc7ffc7c6c720564612d9027/lojugukigud.pdf
    • http://huh.hu/UserFiles/File/89254788138.pdf
    • http://zonweringnederland.com/ckfinder/userfiles/files/suwuparisipixabirugorow.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/571v7pj87djoh0p4d2d2crn2u3/padonopewupi.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd61c464cd---36898186998.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=comedic+monologues+for+young+women
    • 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_off0000e5ec.bin
fb053e872c2f21c440d6efd9193ff8886276982b9c4f1123c52c7f71cd4d7989		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 18268 bytes
font_01_sfnt_off00011500.bin
78b5139a8a1562d4456eca1e11beca217a869dd0415ee61a2332c45602cfde31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 10892 bytes
font_02_sfnt_off00012e02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 16792 bytes

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