Malicious PDF — malware analysis report

Static analysis result for SHA-256 554e11daa5de726f…

MALICIOUS

PDF

93.7 KB Created: 2021-06-27 01:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bd3e588c3a7dbafb56a0ffbf5df16d9 SHA-1: 1e39a9aed226ff7164f8967910bab9abe227894f SHA-256: 554e11daa5de726fb280529805f01c3e7c9c9473cd151ea6b8f5aa4dfe879528
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs, many pointing to WordPress sites using formcraft plugins, suggesting a link farm designed to obscure the ultimate destination. One URL, https://crewmak.ru/uplcv?utm_term=lucy+kincaid+series+in+chronological+order, is explicitly flagged as an external URI. The presence of these link farms and the overall structure strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://crewmak.ru/uplcv?utm_term=lucy+kincaid+series+in+chronological+order
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9333998013---debaruporaso.pdf
    • http://baigeleather.com/userfiles/file/34954396750.pdf
    • https://vegas-shop.net/uploads/files/betorovubekepedagut.pdf
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/jenibuzipobezikonupato.pdf
    • http://studiodabo.eu/userfiles/files/nixujagulafinawowosusiz.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b423c09a317---53604254555.pdf
    • http://shuimotongyuan.com/userfiles/file/zovizuzivaponuf.pdf
    • http://jkbprivateiti.com/userfiles/file/33060066787.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/cf1508f47189bd26de8c80badddfb5a2/bikavunaseluresifo.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b4e411021af8fdda2ea60c98a816125f/5833475526.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d964cb042f---wemidizukevaponuzufi.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd89591bd---luvirixedob.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/7bc3bc80fc55e8b883642b935087ea12/25107682781.pdf
    • https://muguet.fr/sites/default/files/file/30940578944.pdf
    • http://njf724.com/basefile/janatalnajafcom/files/62303035979.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/19ad252dc6aa48808f587534da35523a/90389064273.pdf
    • https://retta-bg.com/userfiles/muxejamedo.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c56b0654867---fodokeranuginavele.pdf
    • https://alihuata.com/userfiles/file/detevebulomijixujit.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a773874b207---vedurodix.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/0qo7vosbgsivtokebprb3ls0ro/josonesibowog.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3365d1b5---28238091151.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f0dc125bcde89e8c8ce83af15a6f4c96/68688287007.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/4626898e62b760e158347c95eae9de21/tuvijetu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 16792 bytes
font_01_sfnt_off00012338.bin
5628070a867fda480f885b2659669b33ed2c1b9e3161243c894177d3ff4c71b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12338 10816 bytes
font_02_sfnt_off00013be3.bin
29d07d847a805ea43a8081c8264fb3f194074b94459f0ed2e05e866080edbbc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE3 17368 bytes