Malicious PDF — malware analysis report

Static analysis result for SHA-256 43db911ad764a2fa…

MALICIOUS

PDF

84.5 KB Created: 2021-07-07 20:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 42ce75a178ec54a104ce63b6a0199594 SHA-1: 023b8cfa2376318006226d9ea3220d8243cf82c8 SHA-256: 43db911ad764a2fa4e506c2635c5b29ae29a6e2bbacc6c8ac79d940348a8e1d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://absolutelyneon.com/userfiles/file/tikosadujezuwebamimot.pdf In PDF document text
    • http://batiment-tunisie.com/userfiles/file/49567993920.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4fa0c89f2---risevotimenivo.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/70175294994.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/2tpbu7i3m6naq68us4lmb15aep/77772833264.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/46353273358.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1237146078---10049295215.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f6f85502b8e481d35ee1173f9de6dfd7/56186401695.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/gezejape.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd717e8a6f---31081144514.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/93d16e896030f0fa24a64f9ffe30306e/newokipid.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f297db60bd---jipemutenerijadakunidi.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/13929316725.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608eebfa7a1b3---23142088249.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5968ae2380579c7a3f75fc15fb7f0274/watedazeg.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fufeksq8634dtgusfsu1ra9oj5/12802119356.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/4335976190.pdfIn PDF document text
    • https://whitesal.com/data/images/file/8267_20210701194959.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/rapekosewese.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/ca7cf0e4c4b0988cbea3155936e6bdc1/94154124224.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa186614a2e---78679520464.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/gag23qju0ouf7cogphao727b6a/lesorevokevidejema.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1112be61b1---1415184981.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/385bd573082f567f3e4dfb87dc031627/kebinapuf.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/takekonofejomod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=adding+a+catalystPDF 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_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 10288 bytes
SHA-256: 34161406490bc9fe7fd3cedef4c91fad2e063d0c00fad7724a761b68dab63944
font_01_sfnt_off00010081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 17196 bytes
SHA-256: 04848f20648002a6a50d5107448cfce5dc546b8abba84a3086e0e4049e2bc8e0