Malicious PDF — malware analysis report

Static analysis result for SHA-256 58142b2a506d2933…

MALICIOUS

PDF

83.2 KB Created: 2021-07-10 02:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1f08e05e1ae1b8df136278a5cc71d19 SHA-1: 44b5c1bfa93ef1d4d67518663e56c5df0e0a077f SHA-256: 58142b2a506d29332be329a60973c1e295301064d1d972eff265256bdc5ed6b3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, many of which are hosted on compromised CMS uploads or disposable domains. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc466f2e9---24482280007.pdf
    • http://matsusushionline.com/uploads/files/torolubizidadepagukog.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744a7a3e78d---barusosajidisedol.pdf
    • http://coming-c.com/userfiles/file/63345184735.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/juforopamosoputipamo.pdf
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/bajuzuwanibukowizo.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160777121c0f35---2066747924.pdf
    • https://holocaustresearch.pl/nowy/photo/file/16015464498.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a008b237a9---9817749928.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3ec52c2f5735abb9df0eb9bdabf63ebe/55042941368.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160942d784c838---dosupagibinafenaf.pdf
    • https://steklo-shik.ru/userfiles/file/filofodobenalaniwosadumo.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/u1ftkr6r6nbi999vgi8mauegl4/45361177468.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c3f15adb0---68801781048.pdf
    • https://didacostruzioni.it/userfiles/file/61234776436.pdf
    • http://abworder.com/uploads/files/suvir.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160878f2c46a5d---17732981938.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff67182c23---40414226585.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/e7d90d8c25b9036d5afb84c1fff17c42/magumabatelavevuzimena.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/mnio7gkg1l07fdufui99df77vh/72376002500.pdf
    • https://bahispesinde.com/gnc/veri/_files/minasaxe.pdf
    • http://www.css-jp.com/upfile/files/2021/06/10/89985369259.pdf
    • http://progfin.pl/userfiles/file/35837136137.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/0918f7be5e51e49167cc7a0fbed9ff61/71292920415.pdf
    • http://absolutelyneon.com/userfiles/file/kidudo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+membrane+that+covers+the+lungs+is+called
    • 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_off0000e2e3.bin
1aa20c4e39f4cb563d5d629bba0770e0259cd7d5e60ba22c98a80050967851cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 16556 bytes
font_01_sfnt_off00010dc1.bin
df1760705fdc92240cf2ae99b35853881d76b956bfa71535127e68f3c04c5534
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 11088 bytes
font_02_sfnt_off00012735.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 16792 bytes