Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1e57491dbe892f…

MALICIOUS

PDF

84.4 KB Created: 2021-08-18 03:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 16c03e0e9a0b076a8aad2549be10aa6c SHA-1: 5c6d1e58f0d8fa825cb843e8f3431f15a3a089c0 SHA-256: 4e1e57491dbe892f6db3c28ee45837fd97bd5c69848bf021c5d561031e3759c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://kfnmsz.com/upfolder/e/files/20210702180744.pdf In PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b7df7dfafc52bcb5114cf968fc6f7539/25835046818.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/42520846574.pdfIn PDF document text
    • http://balone.net/_upload/file///dexurezofezutomekupupu.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021070414132288.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e329f845071---58949254520.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d5ddde9bbdce7f875bb73f3f01ad3d39/sezeweleb.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/gojal.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/nugafi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qfmf0qkktb23todh0mopf05pu3/409087550.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd6b65bfd0---55901549924.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6d6aa182b1a21c238011539d716600de/63607798356.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/87468850906.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bf1e44562---85331754714.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2896396fcee0de3e95076959bb63bd9f/tadolonezol.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075f51ba4cb3---tixowawewek.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/zoluxorewokubivux.pdfIn PDF document text
    • http://charivne.info/images/file/66076781774.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/xerorizibunovok.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/85011578252.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c69da2ca16---sowopudurawaviluma.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/15b6385a1eacc15d7e9592f3cdeca791/fepip.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/sibij.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/dl8gaeec1sf2mn8cq5s2ab1e95/65485978845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=convert+multiple+jpg+to+single+pdf+online+freePDF 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_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 17044 bytes
SHA-256: ac0bc3381996fc0f51fd58e82bc47ceeb6dcb5619ce9699443bf8d0816090853
font_01_sfnt_off0001114c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 11004 bytes
SHA-256: a35e1e7d3302e69e3c6d78815ba99136fc78a058494d9c4e3995cf8aeb79341a
font_02_sfnt_off00012aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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