Malicious PDF — malware analysis report

Static analysis result for SHA-256 a926138345ce4a98…

MALICIOUS

PDF

72.6 KB Created: 2021-09-12 12:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 852ab902a664572ff11dbdf644a42a27 SHA-1: 9566c6f3d9a39d19454ce47c5f1272edc68d0424 SHA-256: a926138345ce4a9858a352e2f235bb18568355733b8c60fab75214989c43a71a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to trick users into downloading files. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports malicious intent. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=need+for+speed+most+wanted+zip+file+download+for+android', indicate a lure to download content, likely malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=need+for+speed+most+wanted+zip+file+download+for+android PDF link annotation
    • http://juditphotography.com/picture/userfiles/file/72961591980.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/20011421107.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/27301315374.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/1i1p1r8vs5fge14tko8sku1bj6/gemowokasa.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/bedemagurixisam.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/nerufezajilug.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/risam.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/nugedevoxikomutobojijisaj.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/68931455978.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/22937602794.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/safasiruvaxotunipom.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/maduranexowuni.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/85777363894.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/ramisabapujipawe.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/jijivopedibife.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/jajetavaxerujedem.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a9be5491---46077799951.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348c7a91442---87821933965.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/27317240652.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/bipufonivefabijoruki.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/rupeg.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/88735012022.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_off0000b843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB843 16680 bytes
SHA-256: 364f7a3d43fceea45cc94bf723934cfb232c3ee805d3e069851ac61c1b9cefc1
font_01_sfnt_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 10784 bytes
SHA-256: 075d7a2a212d1104a1ecb58516a0e63d63acf85a3869122f4714f14ee32d2343