Malicious PDF — malware analysis report

Static analysis result for SHA-256 a493aec5850db855…

MALICIOUS

PDF

86.6 KB Created: 2021-07-14 07:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2ad910d014f9fa603e2b678c316a320b SHA-1: 43efa9e132c14647a228baccac2f58737a53b0e5 SHA-256: a493aec5850db8555b5e8052ea66707dc460445396a19b883dc7d5454f6b1b33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a link farm pointing to compromised WordPress sites, a common tactic for distributing malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway scanning. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd6e92306---77889536049.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6dd91fb1dbd9453361bc418856b28161/32931665798.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/pemitosolenuvikekeb.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b652e550bd---96292785354.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/9493682870.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/jirod.pdfIn PDF document text
    • http://candientushinko.com/images/file/64020523495.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/4tkurfvrjmkcjs6bqcuaore42n/lumusuligedolonuxemovemi.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/42457240926.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc9f408fd1---85666722072.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/duvej.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/44175529690.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/87088961068.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/69894424257.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/ralol.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/vozenanikujuxow.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c15ea540c38---fofujebaxatafu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/f2rdepmt2citmvrfijhqvfqnd3/9623422302.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089202685cd7---44388883631.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/tomimoparuxugoso.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c6321967c---totir.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/fisezuviza.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/gv9tl7ol1l6c29n3l4h1ae05a5/92007574141.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893f03917ea---30158702075.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/p76bqt2jbsvqirtsq1tdkcbqmf/85616024065.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f180c7e58d---nonarezinilobamukoj.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc3247d3f2---fuzekofinowilu.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/hor2te18c7pgl7o145hhhhlmaj/vipalujajijojezovopubexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=i+have+resent+the+mailPDF 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_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 17256 bytes
SHA-256: fd3a81d43f2008676526a7458e4aa443deb1a9a39e4a1671c730f6b08ad058bb
font_01_sfnt_off00011e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001361e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361E 10272 bytes
SHA-256: 0e98f353e43b4fb1b792edc24ab5f03abf850b430c9e089ac26b3c7b0aa6d9de