Malicious PDF — malware analysis report

Static analysis result for SHA-256 05850c8546923c35…

MALICIOUS

PDF

142.5 KB Created: 2021-06-29 21:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e2983c586efdc7b4f8fd0b816e0c80cd SHA-1: c201ef714c540244fde0eed9312144efc6b992ab SHA-256: 05850c8546923c35566c75eaa72e293895387d7b0d69e70b49c5dcd85978b5dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=sat+test+2+answers+and+explanations PDF link annotation
    • http://kochi-mimoto-iin.com/TakamatsuClinic/userfiles/file/48246859487.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/32841748523.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/60694892441.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16082e6d60bbe4---fowupowibevesam.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bcbab0f9c679f66ef6c79f660870ad83/44771649119.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160991459b6bb4---20742445312.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09880e71a1---pifugedol.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094b196af255---korafinofawobowiloxiwivi.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/jamitupiwenamelunelalul.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/30c5d6327b8bde3307221dbc54ca10b7/gifawaf.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/divarutuzobevitan.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090c414433ed---82295411309.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/60578fd1a98508aa7db1c6f7c86a679c/59852704585.pdfIn PDF document text
    • https://unosms.us/userfiles/file/jelop.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/89701708069.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/gexafozogusititijodul.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/jojirazuziwem.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/46786367818.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b280ce06ad6---makidizaluxiwubapudezimul.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5ilepi9vkkots7u32ajqihh40p/5896335409.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160cd07afe88b3---weviwinapikozezat.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/k36dcfbbercj9js5hgfnf0s2hd/tezexidetutavosevimipem.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_off0001c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8A3 19168 bytes
SHA-256: a8df290fbb6d97d6f518d338ede1bdd00e810e1cf677637df98928f6542ada8e
font_01_sfnt_off0001fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB4E 10768 bytes
SHA-256: ae4b0e51f461e526ac3456963691959f99bd9a8d6d13710c1ceaded397618173
font_02_sfnt_off00021450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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