Malicious PDF — malware analysis report

Static analysis result for SHA-256 493a49cfd3711d20…

MALICIOUS

PDF

87.1 KB Created: 2021-07-21 09:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ecb83de316c9493c7c5609dc2aa056c5 SHA-1: b5121b95fe05e1bc0baddc37f114fac211eb5d8a SHA-256: 493a49cfd3711d206677a2cba6d0623b7b48f5e14c977ea301feba16a37030a2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aterhesseg.com/up_image/file/zotina.pdf In PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c5255ba3f---difarubojarazelolibapasow.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f517561555---razumetemiribaluzi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160838e27c6015---89218197516.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/65645058ca5f9afb0233839cb7723fc1/64766772566.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/xajugumorajibun.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/68667105802.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1c7eed8a---benoro.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2ad1de0c0b405ea5f1b6e1296931dd07/12203949022.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/zowazoxatodinag.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/d93124a3c549714e817550de9d86f31f/5698850597.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/v2vo99kcmp6a7sgiajciem49lr/tibevogopagexumut.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609852c00b465---xunanofidujerob.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/28185357125.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/bojalalesijuwefokabe.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/54520954862.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/japusogowetowonawubivo.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/jofusopusesaseso.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/90837102847.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/48cc981405c4322e3f6489db729cdd5f/20715543274.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/96008617964.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608441f13c6ee---mesedawafelerotalonoxiv.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215161529348004.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/lalixuzafujesizam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dark+souls+1+witch+ringPDF 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_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 16836 bytes
SHA-256: a70b4eb417f26e0e11b2dc3f250d06ad78bd21a956c5304c2d25fee5711106cc
font_01_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 10708 bytes
SHA-256: a3161ca7af46bde8281f35f71acca4d2b32c1200f291e4fba364b338151de7de
font_02_sfnt_off00013770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1