Malicious PDF — malware analysis report

Static analysis result for SHA-256 77585d505e627cfe…

MALICIOUS

PDF

72.5 KB Created: 2021-09-02 13:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76a6c35dea47bb00b79e912eca84be54 SHA-1: e2de5d23d9109e5b0acd5f66ac6593871b4a9d94 SHA-256: 77585d505e627cfef8d21d813ca1885e23e2f05a640024afd72f40b15359feb1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=odia+grammar+book+for+aso+pdf+download PDF link annotation
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907b31973e9---19125447378.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9369e8ce1498ec6c536c615e8586f0e2/guwowalakuvidib.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/familebizomet.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/sonakejakibo.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/relexesokibi.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f57b4360e---18439917791.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/8m4te0cn5262t0ii2g4rb0erun/nuniforipidopi.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/fda48a004ceeefc953f7d684abe62ba3/kawufesufofususonudiv.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/29469430782.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/18199998163.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021061117250270554.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/61219217178.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/75e2aeebaf6f3aac63c90bbdb6069886/10444868246.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c032a8d1913---gelelatirovorukivinowus.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/85056851587.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/84fb6ca3c6adb0debeb5a36427964338/38210041425.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b514b9e20a2---57523457908.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16073f2372c800---85740709538.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/52122791750.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/1l3tni4gh5afoosp0h0mjkpj21/wedivexaforadolepiva.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b554d9bb42c---8549123652.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/277d88ab7e72d2139385d6baba442c31/porulexuleb.pdfIn PDF document text
    • http://abc-tel.ru/data/File/dedufapuwejafumopakibim.pdfIn PDF document text
    • http://berbun.com/user_img/file/14259471934.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/piruwanabemeluka.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_off0000b91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD133 10956 bytes
SHA-256: 9e324f71af3043306d90af2b7db0c9031aeeb87ae5230743c4f4e3864b906962
font_02_sfnt_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 16620 bytes
SHA-256: b81891eb7d37469a851d6c49c7f6b7352940e55ad093615771b007c0ea9a1877

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