Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfe745e3f578e46…

MALICIOUS

PDF

92.8 KB Created: 2021-06-28 17:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2148c60d011b14d342b55b4f3c91c084 SHA-1: af4267bbce8efe867146b05012c839972c167186 SHA-256: 1bfe745e3f578e46a3659804999855807a8f6ddf55079b0d96ce08b4422ceeec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The document body is unreadable, but the URL structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16088609356c30---36950228971.pdf
    • http://skupka23.ru/upload/m/jejebowolemevalokukaxi.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/vesisagafum.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607febdfcfece---xujimezepibibusot.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fqf6haqs9uh1c1kp5i06p9hho1/95520147511.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf9de8a19---lanebewivojatexopisejojos.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092099bbb38e---nifabemopudos.pdf
    • https://argumentua.com/i/file/60018173447.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/fvia1glu824b2c3pmjt64de2k9/dilupijosijixe.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a505d857d57---fepukuvizulal.pdf
    • http://bannermaul.com/userData/board/file/78731279561.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/288g0obpl33847j7dmvkpqfbkl/66975733921.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/dd59d9ab52bddcaa64f4f147350ce303/58858674615.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/cdf76eb5157fcd41b1a34571c4a89086/legusowakik.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/18fb077379d4b7fbf8e38e99783808ac/fodimupu.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/bd784b0b082ff04fefedf4992da00827/6315405626.pdf
    • https://ivanda-commerce.hr/userfiles/file/nugedex.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ftbn3p61k30m6uou77pcnift6u/55215687573.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792bf51ced8---75253287145.pdf
    • https://walkandsmile.com/userfiles/file/65789319.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/1d56ff8fbe8e15ecfd067470bd5b7b3c/9301132257.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2ab0cf6a0---514301443.pdf
    • http://uticachemical.com/files/upload/files/sukaxodilalefatoxuzijo.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/8256fbac60c4c0136c24b0ecf15aad12/jananikeposulavadulopu.pdf
    • http://biotledlight.com/userfiles/file///domosulilela.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=practical+philosophy+of+sport+and+physical+activity+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef2b.bin
3936b20cd7ad641014892894bc5b10a8439ff58fc34e47fe5503c3ac9447240d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 10768 bytes
font_01_sfnt_off000107e1.bin
f964cf5152d4034677d3d97b2fc25bfea9c2dbf17658275bf05a53b99bcec16e
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E1 16680 bytes
font_02_sfnt_off00011f6f.bin
fb195a2ac0aae891a4b227e256e76d89686e3a7beb1fc05560182eafb232ce62
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 17284 bytes
font_03_sfnt_off00014ca3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA3 16792 bytes