Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e8d1aea3f21112…

MALICIOUS

PDF

69.2 KB Created: 2021-09-18 03:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2acdd5d832acb3fa24d6dce7c9055293 SHA-1: a8cfeccc66ba36b943a8dc9eab02096eb3db6fa1 SHA-256: 75e8d1aea3f2111208839cc80986bfdf6ae554604080abe251962909670499e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by the presence of numerous external URIs and link farms hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the structure points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=ds+video+android PDF link annotation
    • http://erbaytag.com/resimler/files/58784270673.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d664a69f2---37534412168.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/sixemoxubagadapoxevexa.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139389a94de1---69901012060.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/82447549155.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109171829283262.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/23754688878.pdfIn PDF document text
    • http://lovesenergy.com/file/23456175610.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161452959a0ded---34605225901.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/14611298362.pdfIn PDF document text
    • http://le383.com/uploads/files/10795444894.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133aeaec42b2---45886341060.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/14760005279.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/narenogugorasovixunux.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3590804fc---pabumenig.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/mibajowobusidotetevimusik.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7ddb68b83---daxenogosunikozatowom.pdfIn PDF document text
    • http://lovesenergy.com/file/givegewerosipox.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/14048451274.pdfIn PDF document text
    • http://splogservice.ru/content/files/70370061779.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/puxareroli.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/depetapojapipewif.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/64678259117.pdfIn PDF document text
    • 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_off0000b224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB224 15264 bytes
SHA-256: f2a9437c7ecf26ca22dddeb7dff2ee9a5db82548782db41f9d68a245427729ab
font_01_sfnt_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 10164 bytes
SHA-256: 3db4ecd9a00dfa9a650dafe6ef8500c485729bcfdbf47b984b15b9ac9cb713e0
font_02_sfnt_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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