Malicious PDF — malware analysis report

Static analysis result for SHA-256 a508202b14674395…

MALICIOUS

PDF

87.0 KB Created: 2021-09-12 23:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b1bfcf9a052bc391cc013d78d9fd9739 SHA-1: 6eb2f02173c55b9ec537724e8f472bba67db93d3 SHA-256: a508202b14674395b3da0e341d6f6da9886446942b514cde0b2a5f10817b71c4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF's structure strongly indicate it's used as a lure to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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 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.prieteniitehnicii.ro/documente/file/wakapukafusaripifas.pdf In PDF document text
    • https://texasbordervolunteers.org/userfiles/file/10129725929.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/80572802422.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/lapifetawerikimajil.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/bopofemunip.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/tazitopidasajunil.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345d466f1d2---mavefajubaxijirik.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/lelubaweto.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/65786017467.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/09a2956173f7e86eb5d4bb3386a41448/68548515921.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/kijipeta.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/36857295851.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613588cbd5679---wuwopuxavijusupuw.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161393d97f3bde---seloxutorimivod.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/111743526041.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/jatisinosamam.pdfIn PDF document text
    • http://pmke.cz/pictures/files/waxokifodadu.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/21583519800.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/mukejebejuxojunulavar.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/30189628902.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/45041739061.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/dipelerag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=thiruttuvcd+sultan+full+moviePDF 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_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 18116 bytes
SHA-256: 82ffad582007165c9c83724de20bb24d08fab06b6b700eeae5d67159e178beaf
font_01_sfnt_off00011da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA3 10868 bytes
SHA-256: 99230a78af5b7510a2ebd9f7f740fd312b3082a926f9e94a3beeddb92f58eddb
font_02_sfnt_off0001369e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1