Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f4802c910fdd6a…

MALICIOUS

PDF

74.7 KB Created: 2021-10-03 15:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a7c5c7514c96961764e9d589a296e64c SHA-1: d22b93ee67be28b655c53a530ad78771270da0ab SHA-256: 83f4802c910fdd6a3a7ce2767fd2a962b7c002a6ba56937e2a9fe608eaf6ad7a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=life+is+meaningless+philosophy PDF link annotation
    • https://costarica4d.com/contents/files/25335039709.pdfIn PDF document text
    • http://ing-ka.com/user_img/file/14506795037.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/58563589419.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/35315543538.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/vusanuwonukezimipuvawit.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/61312313315.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/latewaxog.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e4917e4ddf78b227c1873eecf4b04adb/93616390639.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/90102518260.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/benafive.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe6b6061e---teturejepezifojerewodanap.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/sodimifaxawo.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/72579957667.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/24014788150.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613595075f568---nimalanuxon.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5b0d127f185af07320bb822bc92983e3/fakid.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/lilodupuwob.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/32008809778.pdfIn PDF document text
    • http://www.77ice.com/upload/files/51706534542.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/86736852105.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/zazag.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/sezedib.pdfIn PDF document text
    • 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_off0000ba16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 10680 bytes
SHA-256: 63e2bebe17a4c712a5ea9912da8b1d1296998a5ea2f092ff42e97f8c29d464a9
font_02_sfnt_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 19396 bytes
SHA-256: d7ebf0cfaeb3a460efdd6c6894ad7d946aae24f23e7c783ad51d428cbcbdefb0