Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e9fdec58817c04…

MALICIOUS

PDF

75.3 KB Created: 2021-09-22 16:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17090d05f06068955467ee32e8d406d0 SHA-1: 1777652b71c88ca44f1cad3e2714fd8dbc9a633b SHA-256: 87e9fdec58817c04cdf8c06e5b4006b80735f4b0bea881b90c7e27d5442e1739
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the nature of the links suggest the document is designed to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614892015f8d1---xefiwifajonapabelopufejo.pdf
    • http://gibisch.org/files/files/xiwukad.pdf
    • http://4998horo.gmmwireless.com/contents/files/93363608452.pdf
    • https://mimpishiosatu.com/contents/files/98592145937.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad39e2f27d---kekeperutovus.pdf
    • https://ginniglobal.com/uploads/file/kuzijixu.pdf
    • http://dmychadla.eu/UserFiles/File/16327815851.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f444db737d---14670913866.pdf
    • https://cplastik.eu/data/cms/file/90796853042.pdf
    • http://erh-hu.com/userfiles/file/27180069696.pdf
    • http://kmjmt.com/news/upload/file/210911113756883904w63u7z.pdf
    • http://www.gieskestukadoors.nl/ckfinder/files/files/litoruvinowejafubetito.pdf
    • http://dagmare.de/userfiles/file/dakegeted.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613266412f758---91021811214.pdf
    • http://horvathortho.hu/tmp/jijenafilawekud.pdf
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/76684533190.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614b18dd2af1b---92757334035.pdf
    • https://mollis.rs/files/nokoluv.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/majona.pdf
    • https://castilloexterior.es/ckfinder/userfiles/files/vufedilat.pdf
    • http://kbautotech.com/board/datafiles/imagefile/sapuvigeziberotixivi.pdf
    • http://mygiftltd.com/userfiles/file/7969534868.pdf
    • http://newdimension.su/userfiles/file/vagebaxilaveken.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=venom+2+film+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1ec.bin
b313ae7d23f9d7d09f33beaa29de189ad111b477cad09caaa0d45d2b7fd5e44e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EC 9936 bytes
font_01_sfnt_off0000d7dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 16792 bytes
font_02_sfnt_off0000efef.bin
82c1476c3c08e559cc9063fe3e00c6abeeff9e384146481a396caf1fcbafca4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 18252 bytes