Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4c3145b20a43ec…

MALICIOUS

PDF

92.0 KB Created: 2021-09-17 14:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e1934b5b0b3bf76ca36405377095bc43 SHA-1: 29eeb11e0ad7034d044ad32082d7c84b4b8db7e3 SHA-256: cb4c3145b20a43eca3819fb1f2d52192b2f697c1b3176de47e3fc48cba588468
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://a-metal.e-giant.net/archive/file/files/6535870645.pdf In PDF document text
    • https://shiokuda2.com/contents/files/dupif.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/zadasejiwijepogir.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/48493095514.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a50a15c1---99241273012.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da7021dfc---zedasogudetesero.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021931352266334.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/rabepuxisop.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/pimemivanoxutilelofix.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/08/91222264516.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210917094428.pdfIn PDF document text
    • http://packturf.fr/files/vunozelixosufomu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/rmu808junft74v5ovrrv66t8i5/1873434226.pdfIn PDF document text
    • http://tianfonmm.com/d/files/pewapin.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/12081378862.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/nuned.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/lexofunomasabumuxazo.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/lejunanewevuti.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/98188934015.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/zefewumemirafafo.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/botel.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/tanimaleterule.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/mupubojomu.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/puneruwu.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/50517778717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=watch+atlantis+the+lost+empire+online+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 10736 bytes
SHA-256: 695b50bfc623693b59fe6b2cf31bfb64a2c4c0d3ac37c9cccfb5a4da9efccca4
font_02_sfnt_off00011bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEE 16388 bytes
SHA-256: 3cecd24d7d326d46f8cf5f840d8834f03ec79f9ce2b3cbe15e01b9885af29c80
font_03_sfnt_off00013286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13286 18276 bytes
SHA-256: 5e1a562df05a288fc6347126f6e99517491e63fbf17aa54e4e6cbbc0a8737cc6

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