Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3e52d3be0fae43…

MALICIOUS

PDF

118.1 KB Created: 2021-06-28 08:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a61a2473d166c212aab6fc5cfe8d223 SHA-1: 1c8ad2c3f2bed90ab3544a5f4226411ea0bc1697 SHA-256: fe3e52d3be0fae4340f17bf42a02d8cd0961320ded3e35241a17df7988f378a5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is being distributed via these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9614

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://drafthe.ru/uplcv?utm_term=octothorpe+is+an+alternative+term+for+which+symbol
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/22318042907.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f777efeed26ed4083392184857dd9a64/wusonifujisoso.pdf
    • https://aduanaldelvalle.com/userfiles/file/zokibabojonisopoturovu.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160900233b49ba---51373381256.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac883d623c8---fuvifusivopiloso.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74589e4b7---xakuzaluzoguzovidupebipem.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/l55lj0u2c0chl8e29nlulj78m4/24773962966.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c613edb6ee4f3ddda8949fd82f550895/zuzejafopuxotex.pdf
    • https://advik.net/userfiles/file/11181144568.pdf
    • http://toshiteriyakiburien.com/uploads/files/xojilomudujava.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a8244861edc134cb38717d5a0f38c36f/79583331301.pdf
    • http://curry-box-deluxe.de/userfiles/file/bazoxobodewinojibidu.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160702ceeb780b---47534658559.pdf
    • http://kulturazebrak.cz/userfiles/kinefiguk.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-6-23/20210623021148947786.pdf
    • http://imaginove.eu/data/Files/32600751012.pdf
    • http://absolutelyneon.com/userfiles/file/20258063359.pdf
    • http://dighakanchaninternational.com/FCKeditor/file/6305397976.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074507bb0de7---lotisuzukumif.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/5obv39sprilu7tgmn3e35642gf/dinifulo.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-19/20210519174945386820.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/40508659664.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/esvh6pbvu23bni35dtkqaakrf5/zijukofo.pdf
    • http://gsxr.hu/userfiles/file/wevuw.pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00019bca.bin
9e483b966d599c332a5d6ded9c036dc454f27c53e2468ea340b92dbe711a8e9b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19BCA 19192 bytes
font_00_sfnt_off00012f8e.bin
117c02090221a3a0c86d636733f0a44ec837bef4e65633f5479484368e43e0be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8E 11176 bytes
font_01_sfnt_off00014964.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14964 16792 bytes
font_02_sfnt_off00016176.bin
a7b95d1a03f1bcbc9cffd56fa9d5d3c554262f8fc0f7841bd698d293073b4c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16176 23524 bytes
font_04_sfnt_off0001bc21.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC21 3464 bytes

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