Malicious PDF — malware analysis report

Static analysis result for SHA-256 982a633ced2b2425…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 20:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e93450bc26848b466ad87c7701ed286b SHA-1: d436fdaeeeabb0d6d5b8541b1fd55b9ded9fb438 SHA-256: 982a633ced2b2425fc92222b09f294992d1edb363fcae438e8220571b58bd2f9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with an action trigger, designed to look like a screenshot. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. No scripts were extracted, but the overall structure and link farm point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://skvacations.com/userfiles/file/52547863926.pdf
    • http://zulassung4you.de/bilder/file/siremaxojisu.pdf
    • https://zlato-stribro-investice.com/upload/files/54830228203.pdf
    • https://ijpdua.com/contents/files/togafamizafi.pdf
    • http://chieusangducphat.com/uploads/userfiles/file/92751040420.pdf
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/17541770255.pdf
    • https://rarahil.org.np/ckfinder/userfiles/files/30675071504.pdf
    • https://almentispharma.com/ckfinder/userfiles/files/35686418429.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142d3c996a13---rotejokawufagatevuxo.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f4beda16b---91869206700.pdf
    • http://china-guolin.com/filespath/files/20210907175254.pdf
    • http://poptheme.cn/uploadfile/files/20210916_031248.pdf
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/25871266651.pdf
    • https://kuepancong.com/contents/files/furakofaxenaneduxugu.pdf
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37164807640.pdf
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/36738637691.pdf
    • https://cityface.cz/res/file/97013715899.pdf
    • http://honmamon-s.com/img_seminar/userfiles/file/50861934241.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161417dd319dbc---57297373635.pdf
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/62334685751.pdf
    • http://abyss.sk/userfiles/file/dosufimepafukemamo.pdf
    • http://jyjwqj.com/uploadfile/file///2021091220355732.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c034e826---16193463923.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/lipafudada.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=most+downloaded+android+games
    • 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_off0000b33a.bin
c148b27931b7970a1df704479779c465db2ea3b7c70567501f686c30cfa191ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xB33A 10672 bytes
font_01_sfnt_off0000cb8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8B 16792 bytes
font_02_sfnt_off0000e39d.bin
1d08bef64f4bd0c2bf0c33879adde35db6c71ac005ce275dd50c05a1dee73e58
pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 14288 bytes