Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cd513f3c370400…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 20:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e36cc0fe6019508ce60e2efc8c605292 SHA-1: e62f9b171bb53e2d18673659034d63945544d08c SHA-256: 17cd513f3c3704002919131a467e36a2e03db87307d3d94e5fb3bcda1114b51e
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. Heuristics indicate a link farm designed to trick users into downloading files, and a visual download button lure. ClamAV detection confirms the malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=piano+keyboard+download+apk PDF link annotation
    • http://loscogliodifavignana.it/userfiles/files/54786473317.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/budofudemuj.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/bozivuzijiru.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/8228210094.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/93644854175.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/63585586613.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/marukuserubafegax.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/84836995622.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/1594229116.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/nomeguzofiselijatatelu.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/nelemumilorufusibu.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/pogodoxewovugonov.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/wasuxaxete.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eceac2de79---39054972269.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/63358165434.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/12046935965.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/87605269901.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16131938ae255d---bekegiwajeg.pdfIn PDF document text
    • http://newworldss.com/uploads/file/23171682652.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613052ce3bdd9---wexuga.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/vojugeselujabelekafi.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/71637521693.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/dabemipevofifugazaxuje.pdfIn PDF document text
    • http://synowka.pl/galeria/file/fiveju.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/86747735277.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141a766bb268---46630231083.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_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 16488 bytes
SHA-256: 2ee5d8a69e08904560defbeb83695781c2ec8c58f28c5a0124b8b9a28ef6af32
font_01_sfnt_off00011047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 10552 bytes
SHA-256: 7d583f430249b6cf5871a385f0f74793bd70bb48fe9ed595473d4d973af04c82
font_02_sfnt_off0001283b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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