Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bd37b6aa5aa747…

MALICIOUS

PDF

85.8 KB Created: 2021-07-01 23:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b10d969143104d736aa36f9887a92967 SHA-1: a9882b2ac416e576e1068ba9ba98d3b2d0f4bb92 SHA-256: b5bd37b6aa5aa7473aad03fe327959f936ca9e8ce0a34bd7e9be08af6877f9b0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress sites, suggesting a phishing or SEO manipulation scheme. The presence of multiple external URIs and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6cd2790c2---80572547452.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822bd78f506---96616528392.pdf
    • https://radmangroup-ye.com/rgfiles/file/rizosizupusogalugud.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e368a741---zatajivuwolowawuzera.pdf
    • http://chizclean.ru/files/fck/file/34844322714.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a31885658d24ee30a3a3039eba832f41/39624901207.pdf
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/renudukejulubes.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/28cjtol0lb8svfaj8ep5vvap43/zezopumotoderarorofujudod.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c599aee6585---mojusewibewet.pdf
    • http://ttlh.vn/storage/ckfinder/files/11334079867.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a899996162---33215225118.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160703eb6ab192---1763506138.pdf
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/nilazowo.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3e766709---988570142.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/161d6d14249d20d1f2f937a9b1fb40f5/setesatejufiwixuse.pdf
    • https://benqmusicworkshop.com/fupload/file/simizizuxexabojufuvul.pdf
    • http://saokienviet.com/uploads/image/files/34115756758.pdf
    • http://praguetransfer.com/files/file/22717861117.pdf
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/gesaputubuwili.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/42c737812614646c5a79bb8957bea3e1/41101218426.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/1ff8a2cc1efd741e9eeb07880960656d/nuzoxurikoribo.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078721ed1aa3---moroliwuwugebokivawifaruw.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/tokuniromilukot.pdf
    • http://aligokdemir.com/resimler/files/30729231627.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cars+with+6+speed+manual+transmission
    • 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_off0000ed80.bin
38699be0c38156b263f4d00ae58268e26da12b686e74904733b1c6f8c3ad6a07
pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 16504 bytes
font_01_sfnt_off00011854.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11854 16792 bytes
font_02_sfnt_off0001306b.bin
9ce00096b3c18ca4a1f2b5f27b28330eee104677c9d8dbe539ce5d1cbeba4b13
pdf-font-stream PDF embedded font (sfnt) at offset 0x1306B 11040 bytes