Malicious PDF — malware analysis report

Static analysis result for SHA-256 989c84698c920258…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 20:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 208e876b9de1737c27ed4bdb26395dd0 SHA-1: cd8f30c9e568eafe967fc941677a4a17fcdb19da SHA-256: 989c84698c92025865a1525b59129837930537b73365d4d13595819f21376280
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The PDF's structure and numerous external links suggest it's designed to lead users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=turn+based+tactics+android PDF link annotation
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/07e3944733f482cf8e9e2c4b7e8060e6/jumobox.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/nilosipubixatol.pdfIn PDF document text
    • http://yejida.com/userfiles/file/kemuxiguvizumi.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/wafudijaporokex.pdfIn PDF document text
    • http://cascad-trans.ru/files/legiseb.pdfIn PDF document text
    • https://iohrp.org/f_files/files/64199460813.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fddfcda170---82240098744.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/kezumuz.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/83871360294.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/69516794856.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/foxukowunevepokezupofe.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/noxulovunofirukupesi.pdfIn PDF document text
    • http://ecpa.fr/uploaded/file/98155847620.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87689083411.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/bulenixodepegowaxaxomed.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/lodunewabokeg.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/dukuriposivumisapumom.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/72256775539.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/78029560742.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/87732705146.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/48143434410.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/eae8ef2d2fa1d4aa7ab13742c781312c/zugiwenoja.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/26837756182.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_off0000d940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 10520 bytes
SHA-256: 08f938c8a7c12c8a410f8cceb9fc616cd931008ee54307128cb2bf4511258e18
font_01_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 18236 bytes
SHA-256: 99526a077d4c23192b4659358a345633b5631b5566c15be57082a2e402b6abde
font_02_sfnt_off000120be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1