Malicious PDF — malware analysis report

Static analysis result for SHA-256 df52366aeca407b5…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 19:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe4dd5cd8acae34101a3d24c3ba91822 SHA-1: b9a02a6e7d87a482769220dc7227ee3c6965e2e0 SHA-256: df52366aeca407b5ac57b2e968976792cb79ffdea60c2bd51392dece046d7c39
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. These links likely serve as lures for phishing or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=2014+ford+ranger+xl+px+manual+4x4 PDF link annotation
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c3c37f3b8007595722be07ff882949f4/zunazaserisenawuvujokigem.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d43cf091d---wikakeju.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/e8u0pnps6gaig4oovh76vpu1a3/nizijofefoleso.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/dokepubifegibisiwuwuforen.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce3b542a92---bavitawagugakenipuj.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/dozutozoza.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/30543043378.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfc4ba2d1e---jufij.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/1472a558e6037075939efb8b347d9d93/28554590807.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/49408939541.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160960542ee08f---13893087526.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8e6f4fffa---99474540735.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/samepijasiw.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/nipivutobazes.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7b6e964a7a9f4db7ceb30164bb2a9cbb/misiguvoja.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/fomabezabis.pdfIn PDF document text
    • http://fitviewer.biz/files/file/pezusuliriwanikas.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/eadff73c498db08e6edbf20d96a7c49d/20807077129.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/fr497u84isvjqmmql23tf4knqv/74819507992.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/popokowuvupudepofiku.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/80533166090.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/kijabalifokisomijir.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/f9ad1a9c471d13706a88fc770f6b32a9/kakolofu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1df86f2d7---punerisazu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7f8990842bd66b22c2c272957a89ef8d/77260927591.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/53861007625.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 10960 bytes
SHA-256: 8969c946a58ba2b16d36199e19d8f7e9bfa05405e1676fbb8970268457f7d362
font_02_sfnt_off000103fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FB 17592 bytes
SHA-256: 40d0652ed29205847ad307316f652cf86fe23ab981f7b196e18c0f728862ec4f

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