Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d02476488bd75dc…

MALICIOUS

PDF

67.2 KB Created: 2021-10-03 22:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 00390beac58b36acd6cedc68aceccc57 SHA-1: 8a14124fc5dcadbf71df7c5b08880998dedc8bd2 SHA-256: 6d02476488bd75dc1117ce491fb995511254baf6deee92c19f70782a2b46f415
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and is flagged as a phishing lure due to its image-only nature and click-outward actions. The document body is heavily obfuscated, but the heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=chemistry+the+molecular+nature+of+matter+and+change+answers PDF link annotation
    • http://newabel.com/ckfinder/userfiles/files/56313741794.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/sodiponozokabejibugofawe.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bcf097d28a---75622882210.pdfIn PDF document text
    • https://blokhol.com/upload/files/fukafafoxaxijiku.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/81059138139.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/58860331753.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/gumom.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614569ee3d30e---jufaped.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/volabepuputu.pdfIn PDF document text
    • http://royalgroup.at/tmp/31994916595.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/22243933491.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/65409954448.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/lur8k8pok978skgrvt9k6jksmq/kuzunakogogonoxonijef.pdfIn PDF document text
    • http://bscartridge.com/pic/86903077730.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/25088659045.pdfIn PDF document text
    • http://fgosvo.ru/files/files/81069126506.pdfIn PDF document text
    • http://asja.ua/userfiles/file/35589584258.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145256732c71---28363719719.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/41811553784.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/katoranobo.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_off0000aab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAB9 13860 bytes
SHA-256: d88497c317cad75ace5aad77f762398652c8c79b5093433c048abaf57515292c
font_01_sfnt_off0000ccf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 11252 bytes
SHA-256: b99f50e91fe303a9ec3d64d3a0a1e6446d0a7ee2605500ea328da31f548b1993

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