Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedb2759292d73e2…

MALICIOUS

PDF

84.6 KB Created: 2021-08-06 03:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99ae3db2edc8e2057fb6053bd29fa0c2 SHA-1: 2e6158bd8a7629bab1af342d74d82a440eec3850 SHA-256: fedb2759292d73e28d40cd106dcaa3245df831d978b35da80e09b7681ff4d770
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of embedded URLs and the overall structure suggest an attempt to lure victims to phishing or malware distribution sites, likely delivered as a spearphishing attachment.

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://wastran.ru/uplcv?utm_term=how+do+you+reset+a+sunbeam+electric+blanket PDF link annotation
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/eacd1d881310cd6ef40b7f31b2f1e837/kojaliwiniboga.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0cbb481b39067340e6568f54ecaa039d/gobasilizabutitisux.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/loposutalebozinosip.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/vikola.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/08457f2c0a421fdd13d42e5fba9f3762/kasopufudepazumuba.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/vemoxujijuwobipusodes.pdfIn PDF document text
    • http://vswet.ru/f/44370462909.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/89c340aaac0a0bb47fa44cfa15d386e9/sakorajolotekivu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608717f6134a5---vukatup.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/5doge2tnq38100gv6dh7l4n5hd/xobazaf.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/safaledubig.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/68577595416.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/golerebarapepapubeno.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1a5f32b1---famaxosute.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f392c4385db450c9d017912345949203/91101451021.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/josumepepopulisafof.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/40f706b82592e8f0d418ee3e273b604a/39300298607.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb6699aa450---44397840103.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/72124489338.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/55585913119.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/r8ul41tlng6evef3n5s802251n/70947661167.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/73998227858.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/50219279917.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/lifulutigiradudoki.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_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 17460 bytes
SHA-256: 6a8ff0dd46db47943b36873cf1e3ae107d57e14217d173fbfa4cd781f40a2a6c
font_01_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 11056 bytes
SHA-256: bbe353fe1bdf6e44acfa51919ca752dbee25ad0c7eb3b1cd55040623f781f858
font_02_sfnt_off00012d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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