Malicious PDF — malware analysis report

Static analysis result for SHA-256 735824f55e51c4b5…

MALICIOUS

PDF

94.2 KB Created: 2021-07-28 05:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dabab5e44eb9c151bd09f3159dfcada5 SHA-1: 5c0f576403870ccb75a3b6239b7b26803d31b5a5 SHA-256: 735824f55e51c4b50738ea8874d9f5876c977d8c9f24edc63fb0bdef2cb00672
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive lure' heuristic suggests the document is designed to trick users into downloading an encrypted file, often used to bypass security gateways. The numerous links to disposable hosting and compromised CMS upload directories further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://meble-tk.pl/userfiles/file/11637989651.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609872004cf50---84919537365.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089e52e426c3---65605273589.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/rrv96vfo5kebv2n8tdqb2eil0e/nuluparevutu.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/82599906435.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/04911859e0786ab79285cd2e8f950ab3/subiborotumaserowuzesuto.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/luroga.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/99970696423.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/zilobulumuzaxilewuma.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/turirumuvobepanudux.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/28399744154.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/01572c76c53ad4e272a84e4138389661/giluvivolugakekigowawo.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/461696240.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/zejedugerix.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/rgtudfldakc8070huqtpds7mj4/61494769057.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/je30gb5jo9luntrhs1eb4rhkcm/4190535029.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609442bbd7b6e---89138517243.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/siwejejidagemomemagikife.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/20918366759.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/pdlvn788e8slpid6jhqtan36ii/55104912254.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607047dc3c562---satibimap.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6612493aa78f0afbd014f4fa60dab482/89140591459.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/jadupokimafugavuxabexena.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d14d371ca9952639e0f6ab1a08312a8c/68595754608.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/jalidojipigivasutit.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715ee40e874---vimitojojopedolojin.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/wiwanonutewuvaxidaxerigex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+enter+unlock+code+alcatelPDF 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_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 10372 bytes
SHA-256: da8b71f8c387ddf54398f53aefadaf221ad444fa2a68ebf59918e14b0a99b92e
font_01_sfnt_off00012480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 17324 bytes
SHA-256: cbf4f049d0b100d7bd6561cb6ddfb30aced6de45edc2dda13ffed4f097a6ad38
font_02_sfnt_off00015223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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