Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d53363d8ae9c8e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-03 06:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7fe450c404c0e35f85e84984131b63d SHA-1: b485f94583f826d580bee9b53cc3d21c81d28fa7 SHA-256: 61d53363d8ae9c8e573fe76433626c8d58d64df8a8aaf77668e567ecd2e9e2d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=beef+cattle+production+manual+pdf PDF link annotation
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092006b3d705---20461817413.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ea8e4567---sijutugitu.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/tunopisire.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160858f22ddc50---wakivewozufoj.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/a8fd6eaf142da2428a7115cc5374c55b/42288722959.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/mosotomugax.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/binipodelipopove.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/6s1qp2a0p25nlh7irrnopb1ms3/fefujelotesisojusokozitox.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/84245515796.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75b7141970---43058499923.pdfIn PDF document text
    • http://specimport.by/files/files/weduxovapapef.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4qsgope580n2lamqbm2jlgcbr8/wiparenowuparekowe.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609d99be5b711---wemagenupexu.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090309270683.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/vuguxujaleroxasib.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082964b4dd8e---92868464151.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/19090534269.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/24850446384.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/25778768078.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/gozegatevajex.pdfIn PDF document text
    • https://digireg.si/upload/11270659445.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/59318514131.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/belalu.pdfIn PDF document text
    • https://tekmaker.com/upload/files/samew.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210622220651.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_off0000b69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69E 10764 bytes
SHA-256: 7ba2b5fe34613b2f3f8262d1150165ee5878216419d0bd30603c6d422e085eec
font_01_sfnt_off0000cf58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 15364 bytes
SHA-256: 4a50c53f1511beaba6696bdc138746393691c4c2215c09a49dbc7e558caf2bb4

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