Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4904702187a1b1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 13:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9648335de9f864973528916f6ce2a217 SHA-1: aa62fbecea5d0f7dcbc2d87702cc76add149a962 SHA-256: 9b4904702187a1b11db477e0e2dd316318494efe86ede89bee8d9815a5f16e08
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating the presence of algorithmically generated and link farm URLs. These URLs are likely used to redirect users to phishing sites or download further malicious content. The PDF structure itself appears to be a lure, leveraging link farms on potentially compromised or disposable hosting to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=kindergarten+coloring+pages+pdf PDF link annotation
    • http://dycelife.com/userfiles/file/bejaritifutiwutatozalos.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/gorifazawesoxivixunamow.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893f57a95c4---mupikuso.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/refugibibumekufaf.pdfIn PDF document text
    • http://imaginove.eu/data/Files/61552007438.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/tenixawa.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/2060079862.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/88382594741.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/10874984898.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/mifujepatubapawapivud.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/xezuzikufalowasipok.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/zomuzaxekotenowenofugozep.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/20045295945.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/92172834962.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160867039bda82---8256244656.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/vewipudazusuminaputumobu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a43c98384---30693130633.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/80388058c7563e65bac002d8679cd19a/66660746104.pdfIn PDF document text
    • https://tsegypt.com/file/neranomaxuzowuwiripalin.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7q9r9luo4qbiat4epsmjg3bcai/63829060653.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd17c7704a---tarakegijoweli.pdfIn PDF document text
    • https://windscrm.net/files/file/fudixogowusek.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a391ccd45e---suxumewejotej.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/54366944079.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/30165666574.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/74790843652.pdfIn PDF document text
    • 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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 10784 bytes
SHA-256: e8f60b9a42a3a8f9d10aea4b9b0dd725a499aae30b741f316a1b2fc1c3cbf700
font_02_sfnt_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 16784 bytes
SHA-256: 395cf4c3eefa79e9b42ed8f2a9a6b69bb5335f9e9885c3ae2588a2cf3846cfbc

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