Malicious PDF — malware analysis report

Static analysis result for SHA-256 759c89eefa1de965…

MALICIOUS

PDF

88.1 KB Created: 2021-08-25 02:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8f91c56dc3f0af02a2da62081af687bf SHA-1: f601fed142aa5de00af0b8f365d6ff0556f6d680 SHA-256: 759c89eefa1de96583063bb9227e998317e55909186645d578de707a3681cb7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pixomot.ru/uplcv?utm_term=what+color+does+violet+and+blue+make PDF link annotation
    • https://activepymes.com/pub/file/50046416475.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089f83701f7f---jemijeka.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/590a7eb1e2f6796e117f9f2572c4575f/kidol.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/44565412104.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/ramediganifojojo.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607975c11707c---tugujotu.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/82629615408.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/34730519913.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608405651f530---nisikevadi.pdfIn PDF document text
    • https://hirurgija.me//files/sorebugobijotugog.pdfIn PDF document text
    • http://trevorhannant.com/20190055654.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af8253c3a90---wesil.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070815b5cce4---3340400018.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/b2aq4kjn3t3lmnsl2mkfkuu61d/2616486210.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/88144161156.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/2229ed9500dfcd902555e7bb69268a04/82701888309.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/dokotiwakajubapenidu.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/67289360932.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/latepewuxok.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/mazigul.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/s1h5tsuddtvvsghboljee8mna6/27539540254.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089df1b583f6---99081802316.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/ziwedokazuva.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_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 11028 bytes
SHA-256: 6e479a56848d61256d02953a2796536d9fdab0e437c6e3e70e2188ee105f03c3
font_01_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 16820 bytes
SHA-256: 2f311c1b67366b8c3a65c8c5b8add104fcc724925917b4865bcab592d23fe6a8
font_02_sfnt_off00013844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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