Malicious PDF — malware analysis report

Static analysis result for SHA-256 4284cb838f9a76a2…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 17:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d599b6cb945d07394d0b1439df7e2a61 SHA-1: a50e79c78b1ea831b43da95be7de7092a398bc30 SHA-256: 4284cb838f9a76a2fcb91549d43516f4e556ccb9718c2a09d6189734b123e350
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161390fb530061---labeb.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b567e86189---zoxopefizenaro.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/46069066885.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/rajuvususorabenukevox.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/wetebogarozidovefubu.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/jirebunimipijag.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be4850f67d---dubupolomotobob.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bhq23hrkb1h8orpjbmf58h8at0/romitogoxunoja.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613321639e943---kuwane.pdfIn PDF document text
    • http://poiskvod.ru/images/file/jivop.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/83866314300.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43a842b5569c4a78459b071c5a6f8207/bulesilolokebamux.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/1449685773.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/watuzopilijugapoxebuni.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/lufuvasu.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/51121436302.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/39616067092.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/mozoduxebugotadedewoteg.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/buwarewogonarikuwixiri.pdfIn PDF document text
    • http://dmkert.hu/files/file/tilogabagufejomezizab.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/71194537522.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613e1ebbc7ab5---92146983617.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/pifofilive.pdfIn PDF document text
    • http://chieucoingason.vn/files/68997774400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=osu+apk+downloadPDF 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_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 10264 bytes
SHA-256: b437831739016aa34a3bffe625213295cf517856505e9ff893cf199718218908
font_02_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 18336 bytes
SHA-256: 3b8f63eae19090d5cdf58ec0431e17ec72db016ccad95b7ccd5a710bb246f7e4

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