Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f77af285c5c40f…

MALICIOUS

PDF

84.2 KB Created: 2021-07-01 09:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63434a56349d4c99f9d9fbdf53f14f62 SHA-1: a2a8107acf889697dcba9d33972e930f36b7390b SHA-256: e9f77af285c5c40fd079972d8c3a16cc451eab076e3a40d9eae0150c69bbbddb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and embedded URLs strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160997d4e2d080---rebavawivok.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/0pljlieke881l0ocn1ufljtc5k/86971944946.pdf
    • http://yuha.be/_files/file/34816785195.pdf
    • http://cuadepthanglong.com/images/ckeditor/files/94249850164.pdf
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/8359905011.pdf
    • https://energooptima.hu/upload/File/78061460888.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dc849611d31---78012848942.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/ifka2vc4ujm7bmhnr3dtkvqcj1/mebefegisid.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/en9lnqfo6f34tbt82nf0a6e3em/60385675942.pdf
    • http://arohitourandtravels.com/userfiles/file/78951812556.pdf
    • https://baxsporthorses.com/userfiles/file/fifonen.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0c9a8418---zugagafatunufoxesejifax.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36af5291f6---75501093716.pdf
    • http://palami.by/images/file/45440656166.pdf
    • http://clubselectionvoyages.com/images/file/59956039277.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f825fc93e3---75004214123.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/k4esj6tpdd02flqnqfo840ni1n/nokazagisu.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/151b68vtlvq2lvg7a6qj768o8b/55082452835.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d916a7307---13885147334.pdf
    • https://bamor.org/userfiles/file/19449662300.pdf
    • http://houselandia.ru/files/bamifivixoxef.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607560e2b1688---33042437450.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a50a563eeca913e38cd35cbd4cc852cf/juwonuwudubamepunifemeze.pdf
    • http://www.kickcommerce.com/userfiles/file/94443725207.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b494063c990---notoluropokoxagisiwaluli.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=both+and+comma
    • 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_off0000ea71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 16792 bytes
font_01_sfnt_off00010288.bin
e652e3a95a357c4f23f08b80e5fbf19dc7bb53f5dc96941c50aa9090e3543127
pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 10148 bytes
font_02_sfnt_off00011904.bin
c9abe6be7ec5204ec7a308599b5695f843b1cf300641a1c3cb8dc73c1be0457c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11904 16584 bytes