Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37d5615c96585ed…

MALICIOUS

PDF

164.6 KB Created: 2021-07-18 02:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 911b23f9f7e4948d811446f2c2192fe5 SHA-1: c1ea7df850019677f7fdc9c856a657cbc357e46d SHA-256: a37d5615c96585edb7a0ef110ec3fe3cac16a6fecd10d050a2c9902b12116f04
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the URL structure and heuristic firings point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

Heuristics 6

  • 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 http://geometracosentino.com/userfiles/files/lipuwifekivuz.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/a84c836077c6efbbb6d851c8243cdab6/37446259576.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2dfa52a94---kopug.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/319ab1332ecbbef1efb2400d7aad07c8/kujixatodosatenuzo.pdf
    • https://alutat.com/data/file/rekuka.pdf
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/nozatezene.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5d9793f62---88425743175.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a23cdecfe6---venebugijiwedubexozagu.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16078b661492f0---74779000476.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/xamujenijimupovufowin.pdf
    • https://ferado.vn/userfiles/file/tegila.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/650e0130801c87e486369d512338eba3/74378100089.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2e48ceea54a9b93ec8c943bde5ec5c43/52562625311.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4ebd672d---lusigalivafulipoga.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/42386a6e1b46c9b4503238fd537a8ddd/pijemesitoxo.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a95e82421c5---gubaxalunifukopun.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/tkmbhqblmtdqj5ojoq3g2juph2/82761007798.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddfdb22d60---tixubujipifexof.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/bdogmbvn8f9gmd59id9treoei5/nozokobofozosafumoxole.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f78261dc64a86b4b3da78e0067e5d38e/xobegubixa.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/84330588645.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/71601911080.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=aesop%27s+fables+with+pictures+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002098f.bin
f96de3fc5ea2e6daa5325cd2668ccf1672e6f21fa3f8cabfd3a8eaa4c80392e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2098F 10956 bytes
font_01_sfnt_off00022305.bin
91a52d4379f290d901532c382d1e19d7f002e32d1a7e4da2ee275e6f2d8b86d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22305 22664 bytes
font_02_sfnt_off000259fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x259FC 16792 bytes
font_03_sfnt_off00027209.bin
9929d42fee2e740979eb13aa64ebb7f06abedeef65f3cedd717dcbae33171681		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27209 4500 bytes

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