Malicious PDF — malware analysis report

Static analysis result for SHA-256 28219e8ac0d03571…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 22:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e8eed60e2ac447fbd08189879876a64c SHA-1: 258d654b80a50e22f575b0dedf5310d13b077183 SHA-256: 28219e8ac0d03571e4a1a6b1be738dc50b999554157e936af8177541b4d881d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple distinct hosts and the use of 'utm_term' parameters in URLs further support the link farm and potential phishing/malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=download+atem+software+control+for+mac PDF link annotation
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18ebcd872---17436354063.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/95e6376d3d3ae334889c6d196dc04678/sobafajiribexisabu.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/49929306334.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe9feecf71---jutedaluzinasugexujixiw.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/befelolugofumugus.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/bbfe9f0f72b7d9f97b4b53f0191536b5/valomavupamibelagigexuzek.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609578f93bc10---11731348243.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1097e14d5ca1db166080f084751aa5c2/62124268571.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/daruxodikibuv.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0eb4ba99---92139414216.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/g8109smu7v3n6ab6s8hncq8enk/34288246575.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/govulo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c792db6c2---mojuxosefuzipikezologabuv.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/zererubawetujesibinutov.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/68459904326.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f22fc022ae4a49fad9476a4841138f23/wozefiwivapunowufaduni.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/sowatuwoxufum.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8cade51e---43451819224.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3dd48d5f---lebosujibezujumipi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2921487887---64444500292.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 10632 bytes
SHA-256: 50c451626479780f11db22a6378281fa1a3c3a224c7b61a4750258eb3329c115
font_02_sfnt_off00011d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8A 29248 bytes
SHA-256: 7c62bde72ea3c2ac86ad7cdca9e092d14dc767349e4041bf11ed918b56af9b98

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