Malicious PDF — malware analysis report

Static analysis result for SHA-256 04955c4c0855f92c…

MALICIOUS

PDF

108.4 KB Created: 2021-07-18 12:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: acf0794871bcded1af826de2c04b49a3 SHA-1: ce11cc9b6cef0214a18adae1f17971b9878e86cd SHA-256: 04955c4c0855f92caf6d45f15a778c490dd6483bf1aafaaa6fc727c1ad22b9e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple compromised WordPress upload directories and other potentially malicious URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware download sites. No scripts were extracted, but the structure and URL findings are sufficient to classify this as a malicious link farm document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/d80pe2ht4qlp2km88p45ndcmvo/nepekuguzinetotisosupiraz.pdf In PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2367e58ad4---67727882505.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f398a05a4---mepobonegagolubetawaguwa.pdfIn PDF document text
    • https://binhvi.com/upload/files/59337202764.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/tetejalul.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/suwozumotuzum.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c3548cb0c---modizofimoxelorisifaluv.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/61374965784.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c0b333f97---87224663238.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d95df3ea921---laledidabusixowo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac98c612c2---paxozobuxepapisefekob.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ac31d843b76494875f6fecdeb1fbf970/fazefemixilelatezurebevu.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/50971688417.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2ee7729230be540bb41612003fdfdb19/39252117678.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3f88aeda---6441079635.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607630cd4cd1f---50463995266.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/matipibavememerosatodavo.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/nefuwipikofiwo.pdfIn PDF document text
    • http://praguetransfer.com/files/file/32908595645.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/146bc32139298fe1a4cc910e57b83aea/deruvokowi.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/xipelatekaduvuw.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/ripibetu.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/61050956215.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062301050766.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a013cc79297---doxajebisumegozifakugepok.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718b08a6ac4---pituritagamovixusojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=thou+shalt+not+use+the+lord%27s+name+in+vainPDF 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_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 17992 bytes
SHA-256: a96d56f0b7a1cd053152c1683cad3d1da9c02e994076b4db062872c07af95e0a
font_01_sfnt_off000158d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170EF 10676 bytes
SHA-256: 53bb31bba9322ee21b751515a2eabaaa0fb4c7e0d33722002cb0949616eb1760
font_03_sfnt_off00018949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18949 16912 bytes
SHA-256: d7c1fc0a0f1944de5bbe92af3c22dcff11a419489f9d8785be1f4de16569bfa3