Malicious PDF — malware analysis report

Static analysis result for SHA-256 f143907d6591d793…

MALICIOUS

PDF

86.9 KB Created: 2021-09-23 07:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d6e8482cb05ca9b640d371941b401e5 SHA-1: 2169e4160d0909b906f70c4846ec570bd953c9c6 SHA-256: f143907d6591d7934386b30fe08463a491be2e9bd21be04cb575b8665842dc9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggest a phishing or malware distribution campaign. The PDF structure and embedded URLs indicate it likely serves as a lure to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=clear+cache+chrome+shortcut+mac
    • https://rsebolivia.org/userfiles/file/96453630900.pdf
    • http://wohntraumgmbh.at/1047845003.pdf
    • https://whatproperty.ng/ckfinder/userfiles/files/vebawexukofijokupetefutu.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161422e1451500---kawim.pdf
    • http://rayer.cn/d/files/vesanireluvojava.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614141e6d85f8---gimeluzawagijunexovujepi.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161374c70c0f7e---66695414720.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494d98bc53b---85119098834.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce651b99a7---2523996969.pdf
    • http://lamay.de/userfiles/file/megabinovote.pdf
    • http://lejonhund.com/upload/fimowesakefekuk.pdf
    • https://zakarpattya-tour.com/upload/vizevaxufenavewolow.pdf
    • http://www.dilipprabhavalkar.com/images/file/44263375041.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/rewezasexuvimow.pdf
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/junasojoxalasolivelez.pdf
    • http://ourpreferred.com/userfiles/files/71061996936.pdf
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/xelezatafoto.pdf
    • https://softwebstar.com/shop/userfiles/file/balojenebasusog.pdf
    • http://wideanglepackaging.com/ckfinder/userfiles/files/fidababezelawomakilugax.pdf
    • https://dcimx.com/files/gedarugesarotanotuz.pdf
    • https://keralatemples.info/ckfinder/userfiles/files/guwet.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8b20d516d---kasedevakow.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/zezaxevitisidewadurelun.pdf
    • http://tyros-club.de/userfiles/file/nofufukekemu.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b46c7a943e---lefugewopa.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_off0000edaf.bin
ac06d62b764ef8aa977f993e1588e688cd2f0c7ff5bc679e5d455d56893e00b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 10432 bytes
font_01_sfnt_off0001056e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 16792 bytes
font_02_sfnt_off00011d80.bin
2785ce576f543f49041551c71e9bf846e1b711d8d32416c947bd883be072d163
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D80 18676 bytes