Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c6831a1677672e…

MALICIOUS

PDF

82.8 KB Created: 2021-06-27 21:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 630b86e52a9b84009503cf03dfc92363 SHA-1: 77e1b553b28f330bb95aba1ed99bd883964ff6aa SHA-256: b0c6831a1677672e6b15902d12e71b18a519e173865a69ab8ae6e3449fede77c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and UTM parameters to obscure the true destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/4qc4sn00tiajmnrlmb4rlchvde/salom.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16082d18b851b3---dovabuguvuba.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935caa34532---48852142197.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d41cdd3d5---risefajara.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b037df74e512fd6220077ec7818737ec/kuvomatovumal.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076832590da9---wufabazijudixo.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/bimiruk.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6aba4135cf9619f768ac6de132016347/vitasureragemazex.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abeaef3e387---jorufeletiwanipatomuraju.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dfa77349c---76637562097.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d68c52c5627---kamamawitawibuverin.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/84d2880a4fbd4f07dd026f35141246a8/13459067452.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/41adc175686e80af8dd3296f556af497/91273858457.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b12371a009e44df86db65808bf8b9f12/bikitagutukulewedabeb.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/11921621601.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/89627092683.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/4f06787a6a8201949d02909dbff77163/xerixidunefisuwetoku.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c290cedc2eb9a2eb111542c1702df3b6/16530897107.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/295721baa02037f4a24a3d0614ad797e/rodoxaxixafi.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d878ba87010c4caaa76c956ebc64f32/fipozi.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/27653054807.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/56880777028.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc54795d404---fuguxivusunenedezuze.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/63ab6f1a7e25700883ee0794fba05c0d/93765349285.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/77d06d77558a6f56e99d75b29b41561e/soxemerirelox.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/fobuxew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=good+manners+and+right+conduct+in+collegePDF 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_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 10956 bytes
SHA-256: d6a558bbd4a3a5d2bcdba92950c69aa4e6782190b627d6682a835be176719190
font_01_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 16796 bytes
SHA-256: e06f6726186e2fb235e14a4f77a25090b605e4d8deb32af3db38ed97d752fdf5
font_02_sfnt_off0001257f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1