Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1cd0ef8e78f256…

MALICIOUS

PDF

91.6 KB Created: 2021-08-07 16:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60e58e9c049dc42dbfda759f262bfb37 SHA-1: a2308bfd24363526eba01eb5e396090bcb4ae0d2 SHA-256: 9c1cd0ef8e78f25615f59498e1446edcc7f6e3cd325bd3b5155da6c834f9f300
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 are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://studioguatta.it/userfiles/files/nubulinep.pdf
    • https://alpinashop.bg/files/92155365786.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3cabbedc---kotenaborofepel.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/i4jva4nr5jbdifhr57qq3mhbpo/22565220066.pdf
    • https://behagi.eus/files/galeria/files/36260826958.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/sr0oumbq16lhnc0m16lvmvqgmf/pagadoreraf.pdf
    • https://dienlanhbachkhoa.info/upload/files/kirivesidipetibivelobobo.pdf
    • http://umffz21.ru/admin/ckfinder/userfiles/files/mugoneda.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/xefemoxonijig.pdf
    • http://aczelzalog.hu/tmp/pafilawozuwo.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c111542b9---kamazote.pdf
    • http://schs1968.com/clients/861610/File/gasudirazeroxavajawaselab.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7be3778751db093b74915f5d5f340bbf/sanaxukoziwejovemojo.pdf
    • http://fibertechnique.com/tmp/file/godabodapiriti.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/hhj0cudabrq0dvhj78j8o580e7/gevafojij.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/mi5voc3ljdvdnh05tmmp6hl79r/pokofitudazivo.pdf
    • https://geneticapanama.com/userfiles/file/99135939136.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/duvipo.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/7904c9hogm7pq6nhvb4l823m03/vufurevifuporoz.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/c0b22mr1fj8ts7jqemie99rong/pabinikamimozel.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da22c4e7387---sudisuviwokusepexij.pdf
    • http://dinskayarealty.ru/media/file/36722692887.pdf
    • http://montaze.org/democms/userfiles/file/zoziwamatekobago.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gerd+diet+plan+menu+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 16792 bytes
font_01_sfnt_off000117c7.bin
d717fb534eb4349486667bf8dc0a321c6111f853d20c947977cf9d3234abab98
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C7 10508 bytes
font_02_sfnt_off00012f97.bin
7f68d83be82a49c0de930193368f22b9d520baab67014430073883d06cca4335
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F97 18596 bytes