Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6026870b6fe458…

MALICIOUS

PDF

99.0 KB Created: 2021-07-25 04:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9b626454770af5648e67d1749d07d16 SHA-1: 8e3b09469af1e1e527084373ff35d96fa9ea9a5a SHA-256: ec6026870b6fe458e5fa6735987241c90c9e7a1f14506fcd4f9fdfa2586e4be8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised CMS upload directories. These links likely serve to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8b3ce1f04d8759150553115b9ef4f491/korofej.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2fa06939d3db7e40218c82a4c9c184ea/dibopisuxiluj.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/o3efctsqf7st5vi6pr9v7j83nq/46351444781.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e58fb47646---saxikifuwukavumuzogorawo.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1625612212.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/nanipezabomi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/bc122fmo93pt3q6035nh6jt0f1/vezotemikasobaboribakuge.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/63673757787.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a93b2236a---bewavogulewipinejubu.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/12428676093.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8790a5b7---tapisizipimogajivimefede.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839b041fc29---59964331444.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/jibekerotijib.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077494311e78---pofogaki.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/30299458971.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/hps0udf6lb7i8cqvjt4b29l82i/18607652748.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/lazer.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/2089948666.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/fubosaj.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/kisejogudewalovotuvomozu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/12f66dfdf935107166e81bcc8bf358af/pupiliputeweveruwux.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/k4hee30eohgpi45tep3nf92prl/10924672177.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/76363203728.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/74479799240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=plants+vs+zombies+garden+warfare+free+download+full+versionPDF 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_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B6 11148 bytes
SHA-256: 578e63a55df84c856d88d2394ddc6799ecc4a47973b03f7fb52266594883be9d
font_02_sfnt_off00014fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAB 17200 bytes
SHA-256: ba3bd0a4fc0bea16deb2f5c7c1f56ed6da458ed7d7cb8aaa45f9d18e7624a648