Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9cf23dedb93321…

MALICIOUS

PDF

86.4 KB Created: 2021-06-30 19:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b809fe022a9e472226406103fbabe7db SHA-1: 675e6fe359440f6ce37b9af16eea2bdc6c8cda24 SHA-256: 0e9cf23dedb9332196daeb92272d812b5ac1ba0b4884459177c93aa5d406d1be
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to trick users into downloading malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/67ojmbseblsu7dbjgloen5j926/tixalufogolisumiliw.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a09388c4ba---xiteninapabepizelolodu.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbcac28d6c---gurar.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/66244h9lk0hkr1hrrr3h3la9i1/85065837678.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160738f4f21c7d---30477968376.pdf
    • http://absigorta.come/file/52265431085.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607540756f6fc---tekudenedepilitotizid.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160967712510cf---95915566946.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vrd9jcouisve48rdc9oejgspu1/85034824659.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/6c23bf948a7b0a56942c91452d23574b/58859345041.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/32157882191.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607891bc7997e---30750860520.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/50956215727.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9859c23bc---73685949495.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9efaf44daba75edf9056410f16383e68/jekozesaze.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/bbdc49f73a726adcf2b3d5e35b1dcffe/dapapuxugipiv.pdf
    • http://hainescentreasia.com/images/file/nonakawurosakezu.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089978f607e9---16192970180.pdf
    • http://sugarfree-gelato.com/upload/file/58844733083.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/46192c2b4b0340046ee8eaf48cc53621/96737941263.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/2a366f52020973f78a698634ea0e3f72/wazusiluvetiguxanajapes.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff6dd2ff8---57475343719.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/0a90173e96c807cf785f7174d3afe289/307824144.pdf
    • https://totounited.com/contents//files/41554658506.pdf
    • http://hieuchuan.com/upload/files/figalagegiza.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=salmon+protein+content
    • 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_off0000ec82.bin
f6dcfe6996dad85fd847aede5865d53279911082d1cf50cd87590b2cddae27a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 17752 bytes
font_01_sfnt_off00011b2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 16792 bytes
font_02_sfnt_off00013342.bin
8bc6eaa2ca9604c5fa362b8e92db981b13faf521bfcd315c033bbcc5253b6b45
pdf-font-stream PDF embedded font (sfnt) at offset 0x13342 10444 bytes