Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcc051a2a0df344…

MALICIOUS

PDF

87.9 KB Created: 2021-09-03 23:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cafd6c0eedca2964c7b7a2e1d4f15fe4 SHA-1: 644a75046515d8b1a22a637a8f31b561b02c56ac SHA-256: 0bcc051a2a0df344f30c9b4bf10656372765da5ab8e827683f507d9ae64d93bf
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 CMS uploads and disposable hosting. Heuristics indicate this is a link farm, likely intended to lure users to malicious sites. ClamAV detection and ML classification further support its malicious nature, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13dcf568f0---venipasuw.pdf In PDF document text
    • http://belniig.by/public/file/89059981226.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883244a92ad---poxojuputetilodulug.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pamuwowodawemubiroxa.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/cabb46f898cf67eb8dda52091199f79b/xibukirepaponi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608697dbadbf6---61839226658.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/19439490646.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/povovalanaropexudelal.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/utnu6p3phnt35oik2kvrqdjcft/zagoraxonoduk.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/15/fekewu.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/78212288549.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/tanonebusixorakidu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0ad17eb7---xinadetotarutumevuxidotaj.pdfIn PDF document text
    • https://kimcert.org/E/file/lilus.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/41423449609.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/dowuletagujafemidiz.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210522093511.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/viriwesetisotuneb.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/ne2cns2ec30sj421s6ul4evdb5/95026595698.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/hb8ffp293gocbn6b079c61r356/zekuwasasazovukixafisoseg.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/dcd578a38105b4585e0920e3cbf28aa3/35943226024.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/88452199793.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/68f741fac1552513bb306082da87972a/19752684335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cyclic+groups+in+abstract+algebra+pdfPDF 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_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 19140 bytes
SHA-256: 6ba602635739c707cb5b501a249305db96df430a555f85cd9378d6e1e0b31597
font_01_sfnt_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B0 11180 bytes
SHA-256: 1d1c529e60a06c8e5b0ff48a673f73016fa1c70b7050311b2acc56fec60d5f60