Malicious PDF — malware analysis report

Static analysis result for SHA-256 a804a5589682d1a0…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 13:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa8d8418fe2fb39ff58162174aa700c9 SHA-1: f87080fcdeee203482cc7206cac5dd741557f74e SHA-256: a804a5589682d1a05d45608c93021432fc710a599b0059ea3374cb663c0013b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=schaum%27s+outline+of+macroeconomics+4th+edition+pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/25386119383.pdf
    • http://hawaiisushi.iorderfoods.com/uploads/files/faguvurebuzakobegitapoke.pdf
    • http://studiozammuner.eu/userfiles/files/53577935908.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36cda0441---sitexonu.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/94668455720.pdf
    • http://bradzo-ep.com/uploads/files/nowamupe.pdf
    • http://malagi.pl/user-files/fck/file/xilidowemope.pdf
    • http://www.poliklinika-hb.cz/userfiles/file/lanoxixakunowipevujop.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614408c21f680---menifisifin.pdf
    • http://4998horo.gmmwireless.com/contents/files/92975178006.pdf
    • http://alptw.com/images/files/zasosujupelufekaguwoko.pdf
    • http://air-ned.com/uploads/files/zezesarirogabusofokug.pdf
    • http://kartywspomnien.pl/uploads/assets/file/15663556467.pdf
    • https://tiguan-wiki.ru/file/xepufixunadojotosadi.pdf
    • http://comitatoamiantovelodromo.org/userfiles/file/jolozafububivoxunaso.pdf
    • http://aaykpn.com/uploads/editor/files/laxurafipitegekogimupi.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c483c57bfb---77153925961.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327da716322---53601452206.pdf
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/mopevutumebi.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/fifaz.pdf
    • http://originalbau.hu/imagesfiles/memugagofawajujita.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/60131348457.pdf
    • https://officialbacknumber.com/editor_up/36479378296.pdf
    • http://jgbt.us/pds/userfiles/files/nexalurowediletopow.pdf
    • https://granitnet.hu/editor_up/fefaker.pdf
    • https://linkevicius.com/upload/galery/file/25315077859.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea36.bin
8edee6bd8a5427dc723019c3059aec274e25106598d1f4d2929499fbd9875336
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 11172 bytes
font_01_sfnt_off00010437.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10437 16792 bytes
font_02_sfnt_off00011c49.bin
dd0e4518d5e83aecefb037b3020b0831523c64ac0118ca279cf47a4e5f12d983
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 17964 bytes