Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8fe8ff6373585b…

MALICIOUS

PDF

97.0 KB Created: 2021-07-02 21:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f51245c9d4336ad42988a268afad77b SHA-1: cf4ce408f2bcff12ea911b168786c07a5ad505fe SHA-256: 0b8fe8ff6373585bc70007a5212641ff9e56b95301696e5247ef8f42db55a9a6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfc046e22a---56114761161.pdf In PDF document text
    • https://tecnicadovolante.com/images/file/20845714157.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/71848048251.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4974c4f26a---juwasufowiv.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a13b40600ec---rumag.pdfIn PDF document text
    • https://emmaushuis.org/pages/mesijimisewafaz.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/jl0qn5fodse7li1e5dfivno5fv/40039336269.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4e586cccdd9c33b1f438ae50cb5ee214/15580379724.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca4c04d55---43316553895.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2c7278b88d7659dc6b77cf26e419937a/42460261945.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/nurugokegopapij.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/168hf5l6velrsnsm1jci6b4fhp/xazowinezupitafitizolidar.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/ferolareriwok.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/4qqbtebv1c2hgumfntr3gora37/refuwovowiro.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/7740543781.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/12053232416.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ce0a6219665ad119cab0f5fe00f986cc/33942004186.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/3707670603.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089af33a8d71---67839769370.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832eb178beb---sudovomasekuba.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/04a2a92bee8fc8a7e090bd285ea0def7/53711459156.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607317d5d4452---juluziwo.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/71649710749.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6b002496a---38039508811.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/pamexuletelerelerubidef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=brooding+in+poultry+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 10832 bytes
SHA-256: 106c491f92457b6ebb7ab07ec9ff40ff0f9c5f3f406ac24c52b19aefd91df748
font_01_sfnt_off00011a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7C 17896 bytes
SHA-256: 070a6328010d6dc971d9d1d3058dc587210bccdca9a2bcf374d92df24c465eb8
font_02_sfnt_off0001491e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491E 16064 bytes
SHA-256: 313b4d1b1f982e25284d2f4e6caf7c0c7767db1f375da95b613bc7d89e59efd8
font_03_sfnt_off00015e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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