Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f76c1de1404b49b…

MALICIOUS

PDF

92.5 KB Created: 2021-08-25 23:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 194b30e37bb84680e94edff561961013 SHA-1: fcc7e7a69f49d4948109d5c09e48f0552976b264 SHA-256: 1f76c1de1404b49b60ac63e954c23dcc486e3cb46e32514a62159f3a3103e518
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution point. It contains numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to malicious sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/47b3c55fdfa25cd7a533744e30cc7bab/994208135.pdf In PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/hq9j2ffl408uti50lrem38bqq6/roregizajofelexip.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/goganowigora.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1c8e770c72b54fbba1bb3e7423ceb562/xefejamijemudutilurorijer.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/bc4c0c95cbd9ad036347e031a99b0036/tiroza.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c358bc1dd88---xusejutigopowewojejamaja.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/faxajajikoxase.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca60fbd68b5---zisum.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608530fc7fcf8---govutipenare.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac876217aa---nugujokabexolarazugedas.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efed0d956d---maronavakeva.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082b34f0fad1---nesiwurid.pdfIn PDF document text
    • http://garderoba.sk/images/_file/11676169797.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/25018113519.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/4610859607.pdfIn PDF document text
    • https://red-adlay.com/upload/files/nowabalatuferekagemapagu.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/gibes.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/xagiwatemasivemilot.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/tajebikamivabarapikebix.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/fepob.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/dirajodoki.pdfIn PDF document text
    • https://cartolmania.it/file/42206850571.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/26304812795.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1ec352fd0a8a3e76456dfadf524e2d66/51989501850.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/24427484432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=racism+and+inequalityPDF link annotation
    • 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_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 10716 bytes
SHA-256: d7301887e6089ea660b54169032c4821461685df2dc20e39938a8659c059ca87
font_01_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13713 16812 bytes
SHA-256: d34cba8ac2a6a55e6976a0b4370c251814c57913f2efc9dc116c194e62afd007