Malicious PDF — malware analysis report

Static analysis result for SHA-256 3036f8c576a5ff9e…

MALICIOUS

PDF

90.1 KB Created: 2021-08-08 00:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 4594e25da0215ca786734e55efbedec6 SHA-1: b4ac534bdeada2c2779c9e14c7075e433e4f59d7 SHA-256: 3036f8c576a5ff9ec1448fdaffbb389bf81ea4872506e0735a84a8497c5422fa
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised or disposable infrastructure, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is unreadable, but the heuristic firings and URL analysis point to a pattern of distributing malicious content through a network of seemingly unrelated websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://horizonpestservices.com/userfile/devomufuvuduri.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f60f054c1db---97890423349.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/11356436427.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/jikipopodoxewusixub.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff53e3e173a---67981528363.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/96330869777.pdfIn PDF document text
    • http://soul-program.com/clients/e/e8/e84723a0d254fbc5507aaa4bd1967541/File/89775188051.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/73461458532.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/5828691194.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/wijivuwa.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/18875111520.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac55179f710---vuvikuloxofizazu.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/79367798553.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/028d6f69770a01140fe04ef1846d8dac/1603801287.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/1ca8ecc0ee455aee9401eb63d944ef5f/30618883693.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/xekavunowujibelofeje.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/bawobufek.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fc53866c9---66875948442.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7ce5f6a0732b53564e6944c951a5d780/malidow.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc46cac20d---39853522588.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607f76096c652---panasavotevevozuno.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/gaturanij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=manual+de+documentacion+militar+sedena+2018PDF 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_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11146 18520 bytes
SHA-256: 7561aa14486067f23b5d8a6a4254162dcb95ceaaac585c6f934ed792e45f738f
font_02_sfnt_off000140ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CA 11128 bytes
SHA-256: c9616cf39f05d0b4b317f2062ac4e38db827c2bacde3cc02cbc3074649b4edfd

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