Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3ce7c5bc935f0c…

MALICIOUS

PDF

95.9 KB Created: 2021-08-14 11:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cccc25aa9af1892e1bf5714995a70c52 SHA-1: aa9513678a7f29d402fbf182d90aa824619e1e59 SHA-256: 6f3ce7c5bc935f0c11988774af424544f45228159ba241c6e4dc7deb0c343ab6
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary indicators are the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://nomylo.ru/uplcv?utm_term=naruto+is+summer%27s+brother+rwby+fanfiction PDF link annotation
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905d262699c---sedufunajugatanoxesik.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f1ce73dc65bdba4ab0365833faf58efa/zuvusurujidofimu.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/46792328516.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8008085b89031c891bacc7296d89f65a/99267426138.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o8j4479cirspk9osi3o2k8hsb4/76478372314.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/30793076597.pdfIn PDF document text
    • http://iwanbim.com/userfiles/files/fobivenomogejiwaxunit.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ac8c4e8b9---190595941.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/94146938417.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/72743353433.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/iads1rh6gttpl1kkqdmfvfmnlt/90795786725.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/porifubule.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/06b9de7877e33705567a631bc1acfdad/mezixijofosarajiku.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/fenipurenukupureribatim.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/541a6d59b9e8709cf12df549b45ac638/newotalupeduveruzinaju.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/76942624862.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/rinovakotel.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/9679847676.pdfIn PDF document text
    • http://olympusflights.com/files/files/78293447911.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68f1b8e9ef---zupixenuvemek.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/cjqq7q96ksgop3ulmne7bvpmr7/62727435556.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160854cf52484c---jizosebe.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/4b2487fc4b02125da83571d1afc70353/83490435372.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/71801972670.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9a6s3u5srneia0n94q75338t7j/40640058877.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 17904 bytes
SHA-256: 0165f818bd4fc7f7c488c99d4c56bc7c5993fdeec2b9201fbee524f311140add
font_01_sfnt_off00012bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFC 11008 bytes
SHA-256: b3b2f8c42a97b4658dc53b125b868e5cdbde1e4dce9290c8bcc0bd6f3c4066d3
font_02_sfnt_off00014586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14586 4816 bytes
SHA-256: c36970e24f9be4689b934296ed55886b7c0a9b261978d1471404b8826a5e49be
font_03_sfnt_off000157c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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