Malicious PDF — malware analysis report

Static analysis result for SHA-256 249b57ef5f618e45…

MALICIOUS

PDF

86.6 KB Created: 2021-09-13 21:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cbf1a0cb745506f24fc881683b7759ca SHA-1: e961e5103b769d48730cc210a9b876dd734293e1 SHA-256: 249b57ef5f618e45a0edb5d3dda20eb52159fb009d92a6f1885cc8806a3bda3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many external URIs pointing to domains that appear to be compromised or disposable hosting. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=bed+wars+game+online PDF link annotation
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e881b989eb6fc65b560cf4e6e5162d0e/70010465937.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/37107745763.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210902210401.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/83709125857.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/26171613169.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/335664c48592bfa3b610a0154ddbd9fd/xejobabigubizelub.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/bagivab.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/sewelafa.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/38951210207.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/pisesovono.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/napijoxuzana.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/musifobaposopegerep.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/70442108227.pdfIn PDF document text
    • http://one9five.com/userfiles/files/18287520191.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/jolunubaguj.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13457370210.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353adb3ac90---6494004131.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613af4c833f1e---39134512256.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/15243884105.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/rawojosotijenovi.pdfIn PDF document text
    • http://hk-keber.de/images/file/83592334983.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/50189400254.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_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 10632 bytes
SHA-256: d335a3a21df0c1e6f2757d3fa05e32985ecd95e7f2dd419c32d4bd1edee669c0
font_02_sfnt_off00011bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 18704 bytes
SHA-256: 9dc9e49271615f1e421b68b2f9985df29ce2427049f716df5670105afbd18380