Malicious PDF — malware analysis report

Static analysis result for SHA-256 532a16776cffffca…

MALICIOUS

PDF

93.1 KB Created: 2021-10-12 04:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d27158fd77cd9139c6234f897e0fcbe8 SHA-1: 6d5b41f859f06322a980c4cd5d91c884628123f6 SHA-256: 532a16776cffffcae06760e35b86052f56c331215aa62a2d564e00296a91a41e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable hosting and compromised CMS upload directories, indicative of a link farm designed to distribute malicious content. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/202bdcae76d13769e2cf9b21f5044490/fizifufonevir.pdf In PDF document text
    • https://cargobull.cz/res/file/tuninonatuwevejeguweji.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/68466056386.pdfIn PDF document text
    • https://resicolor.com/upload/files/32864287662.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1e26f4fb---36337256451.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/8535514290.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/gomuwifufafuzige.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/35662593068.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/noxunego.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/95155491687.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/wafesitilolega.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/33308194626.pdfIn PDF document text
    • http://jyy.jp/ckfinder/userfiles/files/20211002_003040.pdfIn PDF document text
    • http://desirepara.fun4two.pl/uploads/assets/file/patepegewadobogojotu.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/40884549170.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/musufuvigegalasafak.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/nunogekowosaw.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/xizujujonevevanef.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20211006091143.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/sezamowetof.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/93018e3932ccd4fac4a600e558ea6aae/zidugu.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/jojukemagojusomo.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/pabapowedujaper.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/pemazezajujidubebomeniw.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/16329840969.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16151cb1a4371a---paxanomi.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/xaludusewumabutemidas.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/896FEnmJZlk/uplcv?utm_term=inflamed+uvula+after+drinkingPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 21828 bytes
SHA-256: 77c682e5cc59de231b64ea4fefe899b05d5a6b28fe476f4402f7bdfac81cd4f9
font_02_sfnt_off00014ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF9 10616 bytes
SHA-256: f98799897538c1dce55fd52e43307d8e47ed0ffe82a5321a502d80e803efadd3

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