Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d0e667feccf6e6…

MALICIOUS

PDF

70.6 KB Created: 2021-09-09 05:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bf67fa40bfc713a7470113ae962745f SHA-1: 73dbc1d41fedce2d40d4a6404bd55b66c030ba0a SHA-256: 05d0e667feccf6e66e2b561f93076c397bf6ae9d930cc78c7e7bf1df7d8605f4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313388c4e1a---sisamokutogisazikobadu.pdf In PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/bereduzufukapogosulil.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/ronirokiwawonapoke.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/62381136986.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/dd0c627fb5a8e28ec1b838b61435dc43/buvuzar.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/54158746174.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/luravom.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0ba3361b---tugimegavuwi.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/4282840823.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/59796511446.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/27615770988.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/edb71c9d3b0c1c18b6914e54c5c7dbde/pumej.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/43b73266793b5f7170b92dc23d0e4abe/fajubusitiwewigabure.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/76955033264.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/78388308164.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/muximoberilokilowugivaj.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/zexutalewurawamigax.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/45381299462.pdfIn PDF document text
    • http://bienbao.net/uploads/files/virosinepivonanukuba.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/nawatoxefozawowuretikupiz.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/3985654373.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/deverugitukojimirojezara.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/15961069483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+go+gps+hack+androidPDF 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_off0000b3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB5 15956 bytes
SHA-256: 39aad15f4fa16c0da555caa17d02bb04eadc7b0e1a9086cde7def76e6d14d236
font_02_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 10908 bytes
SHA-256: b26675de760d9a68942f27c4e4e9da42656bb56afe4624247a924afac69adf21

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