Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79e09cc8d65625b…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 15:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d04c9004c41b6b94b46527122396baa6 SHA-1: 11378cb02c2198472defd691530da8ea7ae9c2b9 SHA-256: c79e09cc8d65625b62c602c07ef484e76b1bf17f39633d054beb216297218b34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=acceptance+of+resignation+letter+example PDF link annotation
    • https://evpersoneli.net/ev-personeli/file/bogevavilemewawil.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/tefajuk.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/jinufesezor.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/57686627194.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/88155003994.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/tapuravenumunubinex.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/15852362178.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/wopaforoburovakexo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac80357606---20035548540.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/mesizokowivenux.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/35236472ba2bdaff4539ae44b0e5a822/rikej.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mhtg455rii6gq8unnh6tk1j9l2/61713391083.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/qnhhro4esci92pc6siees1dd54/jifevejusoganipepekubozi.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/6492820718.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109250459373044.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/fuzejurazuwom.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/19629244018.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///95223061173.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/nelederesuvo.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/wajuxubegalajuzarose.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/wipizobeje.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/55777500280.pdfIn PDF document text
    • http://briztravel.com/upload/files/65239280261.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/35397209526.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_off0000af88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF88 10908 bytes
SHA-256: 5ad46f55088f4c7da96dc9b8f6b8e2a7fe000c39b119ca8594c9d8ed9578af66
font_01_sfnt_off0000c8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D5 14576 bytes
SHA-256: 6830c74334183bd5f8fe6e690a64f5b616478257da151adf29ade16ea1e8c6e5
font_02_sfnt_off0000ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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