Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a972e3f47157f1…

MALICIOUS

PDF

86.8 KB Created: 2021-07-29 23:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9de5f3bc612712644c43b9329224b373 SHA-1: ea31dd9c7daacdd6cb3640db38234f526003703c SHA-256: 77a972e3f47157f13eab9611e842692d0aacb4a2d07705a6e0c6b0393d1c85f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the presence of numerous external links indicates a strong intent to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=differences+between+formal+functional+and+perceptual+regions PDF link annotation
    • http://haozuowenwang.com/imagefiles/file/77781656.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1845b926---55897065422.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/4de0898eb961594bcd5a34af5f146cca/74812518544.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/u2opoh1gs94o7j59cnn2mcsd5g/mexijopizijewitakurugaj.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160854df1009b5---94960817932.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/bigopefusinexedowupalezag.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/24jerk98ol4uu5fp83mledqpv0/84878313995.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/juguwatezoromobesonata.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/77038746423.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/banipipaxuvonuke.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/pavirudoxezedofe.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/rarulanebiduneroxanaduba.pdfIn PDF document text
    • http://skupka54.ru/upload/m/48238226564.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/18/file/20210618_032451_160.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/72a06903b7902ffc66b844486569807e/literavukezaxusanulesoza.pdfIn PDF document text
    • http://artospace.com/pics/file/68220480462.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/8b3ed800ae9363a6e46590d68707c8ed/madovugoketugogi.pdfIn PDF document text
    • https://panama4d.com/contents//files/biraku.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0529/6ebae968e5e34c66aed62155b3ad5f5f.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/muxakozo.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_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 16952 bytes
SHA-256: b231f5c74f7cd9cf52fcdd3f85d55afba179e8a6263cd4cbc03dc43b580f8a69
font_01_sfnt_off00011a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A53 11288 bytes
SHA-256: 05294dfdb32504fcd2d819ca74eb9455f146f5dd088fabea6adeea26aa5a5d1f
font_02_sfnt_off00013486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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