Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3824fb19551c3c…

MALICIOUS

PDF

69.0 KB Created: 2021-09-21 22:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce039964da03f2068736a714af5a0521 SHA-1: 94fdaa77346f998a9a9176d22d629bee4f850251 SHA-256: 8f3824fb19551c3cc622ab1cc00db24c2bbe9721cc453283a69a3f3c38455775
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution campaign. It contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search results or distribute further payloads. Embedded JavaScript streams are also present, which could be used to facilitate malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://smidgel.ru/uplcv?utm_term=ios+launcher+12+apk PDF link annotation
    • http://suaups.net/userfiles/file/80386442591.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210919042141.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/21296281709.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/8671267434.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/80140316813.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/13631830225.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/nesupalufifodovuwedel.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/letinu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb14b3e34b---wuzuvemuvozoditopivakunav.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/jasub.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/gapemonupe.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4d39f6128d81c3af753deef0efd86228/nadesuleju.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/72052214386.pdfIn PDF document text
    • http://prosquash.by/data/vopezowezetufuwuxadod.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/parixolunotili.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/jujizibasenof.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/95793078332.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/19883006318.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/kituted.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/diwovaxawerofogezi.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/fanipometapagokem.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c314026353---63075387390.pdfIn PDF document text
    • http://ledins.lv/cms/file/ninosasikadumebex.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/18713608695.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/96540332897.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/lozif.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_off0000b1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C8 14600 bytes
SHA-256: 1cf379fa8997a0808b557e27c95bea372dbf1739514f35067a5ffd6fff852f01
font_01_sfnt_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 10596 bytes
SHA-256: ca947a02051f5001493e1784392d8a78b43c06f78a5c05f7ff54e7e17c6db5fc

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