Malicious PDF — malware analysis report

Static analysis result for SHA-256 1234b00f47b9a9b2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 10:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b925c11d5e30355053c2e893369902e SHA-1: a78744dc937bfb5be02694ca609b410e6d245541 SHA-256: 1234b00f47b9a9b2c15be134570a2514271c75894a01c6b0035d8e65497dd376
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ersatzmonitor.de/userfiles/file/48926700006.pdf
    • https://elsadaulte.com/ckfinder/userfiles/files/galimopulezulodujuvuza.pdf
    • http://vagtteam.dk/userfiles/Files/85934942815.pdf
    • http://onlytech-tunisie.com/userfiles/file/limavefadinamaximadireg.pdf
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/tuxopejide.pdf
    • https://sgotomotiv.org/upload/files/21099766104.pdf
    • https://olterus.net/contents/files/sajorozexajakakisilow.pdf
    • https://dm288.rs/slicice/file/lujokoj.pdf
    • http://vitrine-prof.com/files/totatulufitufagasedusafe.pdf
    • https://www.thaiahpa.com/flash/files/77148154419.pdf
    • http://traiteur-ribot.fr/userfiles/file/komurapiporijamagenujuva.pdf
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/nenasiraxawubuzilunimatel.pdf
    • https://projekt-lesen.de/userfiles/file/panewatiro.pdf
    • https://takipbizde.com/calisma2/files/uploads/memumuxetolujos.pdf
    • http://tao-ssct.org/data/upload/file/povutizesivuzemopi.pdf
    • https://semut73.com/contents/files/sikaxutudagoti.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e552eb9fd8---bugeli.pdf
    • https://dcicz.org/userfiles/file/figadebekuziribugonuti.pdf
    • https://samsungdvmklima.com/upload/ckfinder/files/79702484296.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423fffb7d58---83087668465.pdf
    • https://semagro-msw.ru/pics/images/file/sebawujosawere.pdf
    • https://virtrade.gr/userfiles_lybo/file/zovotoden.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/59883948324.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161409d2878b18---19410323329.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa9827878---wukozulolikigazefapuwatur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=com+android+ide+common+process+processexception+org+gradle+process+internal+execexception
    • 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_off0000c624.bin
18cf2bacf6ffdb60428dd31ece977f5feeaf4bd0a5ddd4d351b1e8b8e69f910c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC624 10992 bytes
font_01_sfnt_off0000df77.bin
daa79dd58b5ae8634dfe812eb5d298ae860a821def5597c4ca0eb70097def85b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 23464 bytes
font_02_sfnt_off00011c19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 16792 bytes