Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dec35fc20437115…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 11:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4c0dae43d21c0fbb3b27f97b8896fa0 SHA-1: 67d18fcc0c7f62f427ee1431a1f97692506f380c SHA-256: 2dec35fc204371153771c73f1182595198c4ac8ba456e84c7711b0737aa5452e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure malicious destinations. The document body is unreadable, but the heuristics strongly suggest a phishing or SEO poisoning attack pattern.

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 http://modamoda.nl/uploads/pic_lib/file/gidajekemovipinajadofegul.pdf In PDF document text
    • http://soles2walk.com/data/file/guxek.pdfIn PDF document text
    • https://dalba.net/other_files/File/kuvuvefudowebavevugan.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/96050740326.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/nigujajupikiwovikopax.pdfIn PDF document text
    • http://enkepharma.com/upload/files/65157292963.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d0f139508b5bca72c46cfa2e371c5221/koxalamatomuveg.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/rifodufufuvezadokukamow.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/99195188372.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/06jr9f866ec19qtlrru16fk83m/deserovakijitekava.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/wikulerowiwiwobazunenimas.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/15353683870.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/53272271405.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/pusojobojagawafizap.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021091811484570554.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3b5c4d061---figupadoxojopisizel.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/dupex.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/derog.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/58373965454.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/batumeloxejudovopogadefo.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/83943241838.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/54369877246.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/govolubomakobisoni.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/nunibipegukex.pdfIn PDF document text
    • http://finchamauto.com/pics/tegalefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pixel+gun+games+onlinePDF 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_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 10456 bytes
SHA-256: 0e418c28f9260c61b49164b0aaceb92e69f4768c3b12525d011bfd4a15489968
font_02_sfnt_off000118fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 19072 bytes
SHA-256: 35bbb7e447ae9fa31837e761a6b853e6bf4851ebb0beae7622410625d5a42336