Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c7672d3e839c26…

MALICIOUS

PDF

113.2 KB Created: 2021-06-29 01:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a921dbb9c999e625f3b5fbb0c988edc SHA-1: 97a87e586d7e954a2740303229b9d73b53722d3e SHA-256: 58c7672d3e839c264c61e5b4ddda10d175236268b241c581a1255f225f7ce3e1
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/547905aaa50efb91b3e091dcd623e3b9/38037068207.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/hf95pp9q2qcla41b0u3kbur2md/48620782213.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/jsdkmhkhn62dvr4fa78u3bbrk6/labanuwufizifipazisemip.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/36a6a231b349100ad9b0c0a67b42129b/72586523871.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160988b4c0855f---xaxog.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071140baccea---20365957225.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/c927f619d4418c52d9d99b9d6a357141/naxipixixakowegufosadij.pdf
    • http://plafondchauffant.fr//img/user/file/revaneduwanironomutagubex.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7b8b9272---zezufofabugomesimededeb.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/9uu00jjoj61kkc138rv0r68e1p/18790989852.pdf
    • http://jiehuist.com/userfiles/files/20887694260.pdf
    • http://waukeganeast1980.com/clients/877304/File/1057965529.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daec155ced---varer.pdf
    • https://advantagelic.com/singhania/downloads/file/torotuv.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/ugg5dpadtvgblthnt71piljm04/jezafumilututemome.pdf
    • http://wawabed.pl/uploads/userfiles/file/7755117370.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ff6a9b9c95432689652a36055af6b141/10020349078.pdf
    • http://tourister.kr/userfiles/file/23913365493.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/602c3566ff4511a074bb66b28b1664ea/6282367085.pdf
    • http://abpaluso.com/upload/file/mixevaros.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ba2064cec25a1318b4cf9c159b9ff94e/viref.pdf
    • https://africanresearchcenter.com/userfiles/file/gibogovopofejerizematet.pdf
    • https://buka.ru/sadm_files/kedunipajujejoxebilumere.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/0sujbgjoq7e2l44po59hud2bb2/84456322292.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fbb303cce---23600859540.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=promise+words+from+bible
    • 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_off00015b8d.bin
38f3387d9fe84c7668747b5c7bc0633923da5715b2f409f7d4c4d1c053ffbe6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B8D 10380 bytes
font_01_sfnt_off00017310.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17310 16792 bytes
font_02_sfnt_off00018b22.bin
d154654ef3fee2b6922da3ae1b79f365018c32a1ec8550a3b098b78e497da22d
pdf-font-stream PDF embedded font (sfnt) at offset 0x18B22 16680 bytes