Malicious PDF — malware analysis report

Static analysis result for SHA-256 842f9cb6b4edf99f…

MALICIOUS

PDF

86.7 KB Created: 2021-07-16 21:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b5c8cd8a5b1c3ee126183e2a94da2a59 SHA-1: 4bec9e9062d141fd2943ad5e5eb8be3b818b8c32 SHA-256: 842f9cb6b4edf99f2685eec7c57b00eb555a9614a8ea68b8a093c547f008ecf8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that utilizes a link farm hosted on compromised WordPress sites to direct users to further malicious PDFs. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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 https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2607d381d---52073582228.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/165d8cc45c564d373ad012ad09c1488f/gulifiwapa.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f88801cbe0---pirotajivuvewadakadibeni.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/87316105199.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/rajubukinumiwodenikemor.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/59796499931.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b58d690c744---75640717845.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ccfb8e3f7---fupipedupadopowanoluri.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/tp0c90ag0v7k6542qvn3915ui1/66244831630.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/detofotufetaxiba.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071bcbbf1289---parowalup.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ccdddf541---sefonowu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/058a3fe9c1de44c51ac6048b487dadc0/zubixizenidarevu.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/libubijemebisunibukutax.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/78994197703.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/dotekajojelekuv.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078166933409---sutuselupusabetob.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/nugutomoderaresasuf.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/tepurokamubunasijivofo.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/deduwikovomenavuwiroz.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160839465672ae---kekewirazalol.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/7d30a91a592d9c7c3e2e3c99f56a5bd9/56123065062.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/7368212613.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/votolunogisosoxukuf.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/vewebevedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=velocity+of+being+letters+to+a+young+readerPDF 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_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 17900 bytes
SHA-256: 13d4650eb801a5a6bd831101451551907a98e586e67d968a463e1df660d201c4
font_01_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 10972 bytes
SHA-256: 56396279982fb67ded23926e33efd115e5d1f5c3edd8df929169b2ea8f90bb98
font_02_sfnt_off00013505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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