Malicious PDF — malware analysis report

Static analysis result for SHA-256 1946607ba132ef9a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 22:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee64e519326d22950184390373eb1ba3 SHA-1: 88675c4b0f2b438e1bd2e18af05ce6a971c30436 SHA-256: 1946607ba132ef9a08522bf4220b8f050b0f6794392bacfdbdd722cf2e34b147
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The 'SE_CLICKFIX' heuristic suggests a social engineering attack that instructs the user to press Win+R or paste a command, likely to bypass macro restrictions and execute a secondary payload. Embedded JavaScript streams and numerous external URIs, some pointing to compromised WordPress sites, further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://langeline.com/ckeditor/upload/files/fuvinazipewefit.pdf In PDF document text
    • https://kamarkosong.com/contents/files/3276168410.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/nipisevarigi.pdfIn PDF document text
    • http://orderkai.com/uploads/files/tamokaxukatadusejeneveni.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/85050856210.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/25e19d09295a770cee266dd87b447c30/wutagawukurukavo.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/51807982091.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/woxemujugukofoj.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/25360471891.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142fea3ee01b---nujizo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f07ff03fa---potisumipopuwuralokabu.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/66814708221.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1614724f07be4d---99513223844.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/68298390759.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/f09e79836b8d74a3b4b574b00b2b6872/11328122583.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/xemufipupumudejanifek.pdfIn PDF document text
    • https://redac.ch/upload/jebubimotijuxukofidugaf.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/pidinu.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/id6hdq7t807lska84spdkrdgb2/livifabavawarowo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324af8dc6e0---nikiremakekufedazeje.pdfIn PDF document text
    • http://knipia.com/userfiles/file/61232627374.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/vasepexugarewopizisup.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/37970692064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=turning+off+safe+mode+on+androidPDF 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_off0000c8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 17448 bytes
SHA-256: 0967e1925e950757872ba7b5c77ef203c48b3684d6d00810ecc36d7adc2fbe73
font_02_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 10616 bytes
SHA-256: 741ffc256b13e3b511d37cf07b53b2de83ebcfbd70b829a894c24da87e8ebe59

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