Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0af9c8524c350ab…

MALICIOUS

PDF

87.8 KB Created: 2021-07-03 20:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bae77032d5473f0a0128e2bb72852992 SHA-1: 61fc5f418e2f72838347675e08e27419b14cdc33 SHA-256: b0af9c8524c350ab939ac3d91a2e693b918ce0517e807f202fc5295302bb4318
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these external links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://tipsclubcr.com/campannas/file/58445126625.pdf In PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/133blsr0ebjv3ec06c2h4b3frb/povanugiveritofewam.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f03034c60---tinaperivowa.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/wuvopavujeminuzu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/iam6gj5g920mlc2pj8vrq0e3i3/paxomu.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/gikusalunokato.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093077cac74f---litomusipekosokiru.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/22567050345.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/92874288393.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/90060975051.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/16668758597.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pajometakuzobuxibuxilu.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/jebimixi.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/57379935696.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef00aa94f1---foserobofuxatubebe.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/xidalegifunevagako.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/radidazajodoxopox.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d8fb5606ac876d1b685fe691125db0f2/76931697346.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2fc0db641---jumefobipos.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/kugiwulipu.pdfIn PDF document text
    • https://ecoretras.com/file/14147136638.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7090ac8a---16036879315.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/ratiliwemametazelebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=unity+byte+to+texture2dPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC898 10448 bytes
SHA-256: 958d3ae57f966fbd90e553bab6f84fd3417d7fedb54801a1680fe0c627b84252
font_01_sfnt_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 21872 bytes
SHA-256: 1cff6124a04ad2db1c4aa9a0e6f4ab042a472ce1bc54ae4496889d7b90bbce7a
font_02_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEF 10192 bytes
SHA-256: 91a781a387de2c4d6ccc86ff24314e4809f5bc4d28d7ae360d3abdbb8f76cd45