Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bd7eddb3fbf6c9…

MALICIOUS

PDF

110.3 KB Created: 2021-06-29 17:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 617210ff111f3884caa4a1126a6926ea SHA-1: c844f17155d6f820191df184bae1d8fa9dba619e SHA-256: 98bd7eddb3fbf6c91eba868b1123d4e257b44dcae21e8f8f2eeb6544115beb7c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the link farm pattern is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0831cec7---dumiteginififamole.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd0c1b0f3e---lerevegezobiwe.pdf
    • http://odpadykj.cz/UserFiles/File/wokijavasajoserelomin.pdf
    • http://alexlunacoach.com/img/editor/file/85742709100.pdf
    • https://apsco.ly/userfiles/files/82311421963.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e9bbdd6db---57180044288.pdf
    • http://geniuschulatutor.com/userfiles/files/73180360537.pdf
    • https://dcimx.com/files/2431403629.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fffd7ecf5---zegodaruvenakine.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a7888c35013---96707123011.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/32806939044.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1ca3b6de6---21770269366.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/7ecbae83bad259f6d9283f7241fdd6a0/kemenivekir.pdf
    • http://wagnerfamilyreunion.com/clients/866685/File/52974379195.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/e9b3e2f7322756a78cb40c77270d5443/jokamet.pdf
    • http://zartmobilia.com/userfiles/file/20210605085501.pdf
    • https://hpsoft.shop/upload/files/pavutarulifafeke.pdf
    • http://davidhammerstein.org/userfiles/file/vavorovojevumelaferizuruj.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9edc2b38---xakelifuputanafo.pdf
    • http://dekoblickfang.de/userfiles/file/govikokimereji.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c83197eaf---sonin.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4adadeccc8---nakarog.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/de18df5a7334a30adfe4e91a866ef792/fuvixabusubifanub.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73dcc1439f---xagobamaxiwowemunovugarug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=at+what+extent
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00017443.bin
130c16936562b4f27c69a9a5b6d7e35e0aa4db262e5f731c90a46ce79ce6e4a5
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17443 29852 bytes
font_00_sfnt_off0000f644.bin
97cbd3f31407206aef70790f699abdf4cca1b93ac0610b9710879eea5ed9e13c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 34084 bytes
font_01_sfnt_off00013912.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13912 16792 bytes
font_02_sfnt_off00015128.bin
1602b0a1affd058e8f50328d61282416de6e4678c9186356c8c6f687bf716be7
pdf-font-stream PDF embedded font (sfnt) at offset 0x15128 9848 bytes
font_03_sfnt_off000166c9.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x166C9 3464 bytes