Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea088447e3754d35…

MALICIOUS

PDF

104.3 KB Created: 2021-07-27 14:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22be25b79d664a1a1a1c56ae1ece20fc SHA-1: 94e5d2a510f3a33ea095adf2e3ca904309f14754 SHA-256: ea088447e3754d3517b60b398cb469d7fd04a61c035cc23176bc474b0920ea11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites, likely to download a second-stage payload. The presence of invoice-related language further supports a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cecev.com/stockages/files/98669654763.pdf In PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/21fc0a00960c6b5822e93199922a00d4/mewaroxikuzozud.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/d628f370f23b76b51ae17a58635f8409/meximofoxosopoxu.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/85406207003.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815958c2979---rejesafativibomobidu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/900971911d32912f771c2a06d6e0e594/zekuvu.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/fogugilug.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/96354013678.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/v8otnup73ei2iek3988vmuctcr/xazetobakijopiziroparuw.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/86206277061.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/cf7bf403799b20d4155febf6756af12e/66284074270.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/41445108396.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/50734762055.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/9b4dc9e3c7079ac1d8a19f53b3a50495/77397027895.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/hfs8k5n0p856mvmm4h79qfon0l/98938693587.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/taxako.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dng58lad2r8ncpea5viuf43a55/luseseguwi.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/luzawatogapolidukore.pdfIn PDF document text
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/9844135612.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/evopm69h9m0q0o6mf5ii4578sg/jumexokoxe.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/2528686943.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b9df45965c48f740435554826e4fc9d1/begowowifesumefa.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc0c4d66a---34629201165.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf8fb81ce6---kabunot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+interpret+financial+leveragePDF 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_off000131a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A8 18088 bytes
SHA-256: 792aa26cdf713f803f2bf6e6cd35eae73159b2aa05ab0681f7885c37c26bc214
font_01_sfnt_off000161aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161AA 10628 bytes
SHA-256: b3751a4cf6c76e41ab9abfc652ff687cafad7270a4cd914c0f3312bada2ceadb
font_02_sfnt_off00017a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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