Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa38702f3fa8b96…

MALICIOUS

PDF

91.0 KB Created: 2021-07-26 01:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8513e87259798e1a50989994a5a91341 SHA-1: 9d76e54186166e2618f77fcb33b6dc67fa56f122 SHA-256: 9aa38702f3fa8b96cc4bd7b99b061b5c127a969a3ecba051796fb42e212abe4e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and heuristic firings strongly suggest exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://rts-wm.com/ckfinder/userfiles/files/86570874647.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/23f51bd3b670de81b408efc1e8e9c327/65380232732.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/m8teaa2ii41flih4o2n26qmqcb/54401398966.pdfIn PDF document text
    • https://85097781.com/upload/files/34661470134.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/boteledolilifarifisipoz.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072259dc39f8---kubejax.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087acff10602---vudaniwugiguniwusapitibu.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/viporugeparakofuza.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6e6508d78b729f6e6726d90e7b198f5c/55240057577.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/timuxudepazusabizidoxiz.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/zugogudaxododidobelagop.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/57864065090.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/duzunesuligavo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab4f1b80f---lupenoviwagifolevoduji.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/70422513928.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca000151b06---39055763268.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/42184674562.pdfIn PDF document text
    • http://trivio.it/userfiles/files/58125493557.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d98c331a6dd---gidilenulegilosiz.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/83770ad11d68eef729005e84bbb09b46/vugokixakuluxapinojusuwal.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/23131785697.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8ihvj24e9a05heaov6crjaivb7/xatalezased.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902fa1c6b29---dixotigebezebubadedofe.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/95235990.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d41476772---95962897460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=arrival+full+movie+download+in+hindi+dubbed+filmyzillaPDF link annotation
    • 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_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 18184 bytes
SHA-256: fb6e0f1bc96e37674df8f8ed8b3588268ecec87a338c0b2693aebe012efcbade
font_01_sfnt_off00012c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C77 10900 bytes
SHA-256: 0418604e13ab4cd3df0fd19d80b4608cdd4c6ee80778e5bd0b89dcb009626190
font_02_sfnt_off0001458a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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