Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff188aa695ee162…

MALICIOUS

PDF

75.9 KB Created: 2021-08-16 16:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 665921d9ef1fcce69839effff390fc8c SHA-1: a1586aa567d17ad33e948bd762ff99bdab2e59aa SHA-256: cff188aa695ee1625f2130f6dd5b2af09b28c4ee4c0ce0c6987693231658b4ff
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of URLs, many hosted on disposable domains or compromised CMS uploads, forming a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for user consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=atomic+structure+worksheet+answers+key+pdf PDF link annotation
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/misepalu.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/28083881054.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/xufagipi.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/sisaletemudepogojidalano.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/gurenisowiligifalegex.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785d6ee7b18---lolasoxoxuzenole.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/soxiv.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/dajejorukukoka.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/3444426732.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d47b6eed0---95595821593.pdfIn PDF document text
    • http://garderoba.sk/images/_file/89591317636.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c958637257f---28137619151.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/sexajevamugafikeze.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/qkbjbolbsj2g55dp5p17cg23ql/24313504086.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/jaxaluregetanagaretoso.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b19c7b4191a0e45b94dc3d43cb8fac8c/4057773225.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b330b723eac51f2c1e7644a8e97734f9/pesivufuxinek.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae4b5221ed---bonuj.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/0pp7o901l46spgj4r9v92jsmg5/85734654606.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/23139811915.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/dosof.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/10326512216.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805cc17ee7e---suzapabusafagibutupapi.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/nuvefofoxibux.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC204 18068 bytes
SHA-256: 0fb9af4694ddce7b280a2c84c6e0d17252d81d2d460c1c3e9d09b9770835bc19
font_01_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 11212 bytes
SHA-256: 4ba3b973e55fbfbbd5d447b20d2f3f8c09dceeb9b93983e1807c5a94bf15596a
font_02_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.