Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6837bd497fe575…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 13:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45d1584dd0324ed23f588ea3c9359ea7 SHA-1: 47d4ac927ac546f4917599284f7d7db41c84c6e6 SHA-256: 5e6837bd497fe575808fbcf562a25039442a97e5481c21d288bcf0126f09af10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly indicates the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/uplcv?utm_term=high+school+volleyball+rules+pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/70816348156.pdf
    • https://atamergranit.com/userfiles/file/59573635919.pdf
    • https://alatheir.com/atheirwsfiles/file/nefadivivibopow.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070548f4ae6d---15090296464.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bce543f9b3406fd4e7cff699bfcff563/vosupojifodazomepitunepo.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81ccf0181---61642709429.pdf
    • http://morgancountyoh.com/userimages/bevasusosatogudumer.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160af9b03d0863---16249703416.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0562cd23a2472523f4d265d481f2d69e/vobomijexetagoba.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/a1c396c5f8b12e73836d5a43bb092aac/mumaxejarosesozided.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c685fecca74---59747820242.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739edaf0c5a---xijibamoruladoji.pdf
    • http://project-lovcen.me/userfiles/file/kuzuvidaradogizijogavuxa.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1848d86245babbc0c1f50dc42d529be9/pejebudiva.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1badcd85c31b86917939a98fca1a1aa9/niluwubekoratajapekazafos.pdf
    • https://gonguyenkhoi.vn/upload/files/tafidusozaranasinaga.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/o7mgjegt40mtn93ohoo9qe6th5/tifigiruwudepawabov.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a2e976544---netileribakabuxer.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/7kur4fc0pbsdf8gkbmhb7ras4s/jidexiposufodekoberuso.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/4614026150.pdf
    • http://sodrex.pl/userfiles/file/semanuminojegivimiwi.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/l18pfjn6vibaa7tld3ijp0urk1/felixiwupoporagani.pdf
    • 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_off0000ee28.bin
f528d47c73c6e0dc03dd1510aa65bc3fc6af4022893c1afe440e1e93a56b837b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 18396 bytes
font_01_sfnt_off00011d16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 16792 bytes
font_02_sfnt_off0001352d.bin
23e5670d8f2ab78c594edd98bcea0cd79696324c9399016a77f2ce0ba8461aba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1352D 11108 bytes