Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d19ea080083552…

MALICIOUS

PDF

87.4 KB Created: 2021-09-05 18:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b30ebdc02152e423c10f7c1a564d20d SHA-1: 03078e89e706d00da6f3cdbf9bade69dd76f3208 SHA-256: 52d19ea0800835525cd080a951e9d72bdbfb71466c63e1c3821892d33692f9a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing a large number of URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest a link farm designed to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9568d7fcb8---67321463673.pdf In PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/50872720893.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077253dee094---mavodamitez.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8917c99800d59a4dc818478560701f32/22636493730.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/lt2741lffpkhfu56afdvfp59b7/kipukod.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/talavovuni.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609d673c7c10a---gamoxutuxuxelifujumimokab.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a720996deef---vexetefofotisopaterire.pdfIn PDF document text
    • http://erdbau-rauch.at/fufijoxokiwuwivisikelirek.pdfIn PDF document text
    • http://agama-rc.com/upload/files/34467580006.pdfIn PDF document text
    • https://ivanamihic.com//files/sojojaboxefodegowoba.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/nodekusovovunutadovinek.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3701770998.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2c455ff8bddd20026f5a10408aa38664/49685799229.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b7024980a986ed7dc7a8c0610abba941/xisud.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d61f8bf4d---bolozisowivinijunoso.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9bc35ff2a79515e3bdaf67d118ba79b4/rasixemirukusixiden.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/midedisowejimudejo.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/60150519614.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b576a0025e7---99345528175.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/wubudaxevesiwofofevoxif.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/79689710071.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2ff7458e---22404561378.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/daxiwepasiromarejominu.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/65138137416.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d6ede575---gopajozigezawogirib.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc8319012c---sipegugejalelowe.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/zamitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sdlt+manual+linked+leasesPDF 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_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 18940 bytes
SHA-256: b3fce17dce86fa647e2902a485e55faf103b35af5b73b298cfcb923ddd302dbe
font_01_sfnt_off0001207e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13895 10456 bytes
SHA-256: b041d960c050da2861e7ff3b3989a15d9b7e887f4c3d2187a98de0627a621739