Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d0417d914db096…

MALICIOUS

PDF

82.6 KB Created: 2021-08-18 15:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d2a4a035be856145337b50ccddfb56b2 SHA-1: 98c926f84f331674e5408f2b71aa05c7bb53fc65 SHA-256: b5d0417d914db096d9c786fb155a91ef112794378c5b1df41c98b1ca7359c2a2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure itself is indicative of a link farm designed to obscure the ultimate destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://zop.bg/webroot/img/content/files/pijifutarodukixi.pdf In PDF document text
    • https://notrepanierbio.ch/userfiles/file/mabewokesiraguxoja.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/14766148.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/65101229126.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/vujujobabali.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ac4c38bef---47737198990.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/69676656528.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e61c4500364---dukizodinurawodano.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/leduw.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/56882851530.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30811ed7c2---60924023314.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/pezijasafi.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8c8bbc23d48b1fba3a679110977308b2/34234914554.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc1eb570e6---nubozobiputazeworik.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c928ef686---jidekuza.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/nujumekugowawoz.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/16833328172.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/sunutosonexilapoto.pdfIn PDF document text
    • http://sport-way.ru/img/file/50925461653.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/30761125472.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zikuvotilagoke.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/65920660870.pdfIn PDF document text
    • http://fpole.ru/sadm_files/wokelewot.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/97147988740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=goldman+sachs+global+macro+research+pdfPDF 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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 11056 bytes
SHA-256: 202ae4edf49f188e78bf2e947d7dff14dfadb43936d707aecfb4897131856db9
font_02_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 17492 bytes
SHA-256: 62ea732d9929499bf6fff345aeeac8e472947a1c0884a0fe20c61b2b1e4ac4b4