Malicious PDF — malware analysis report

Static analysis result for SHA-256 986c798c3c288d22…

MALICIOUS

PDF

73.2 KB Created: 2021-09-01 20:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33e0f9a0bf1673683d86c895ad6871c4 SHA-1: 14918aa288fdc933f2b92fbe84f07d57846bcc12 SHA-256: 986c798c3c288d22663838f80d8f2a1c6889dbda4df4d3dddcd51fc89674007b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which appear to be hosted on compromised CMS platforms or disposable hosting. This structure is indicative of a link farm designed to redirect users to malicious sites, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=what+does+the+word+synthesis+mean PDF link annotation
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/86063528478.pdfIn PDF document text
    • https://slide-bearing.com/d/files/76248988300.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608845c05187f---dogewumipiwujosezop.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088dcdfb3926---97825472379.pdfIn PDF document text
    • https://angkagenap.com/contents//files/98905290606.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/cb2940b1be9e63ffb7a9ca3491c5cdc5/tomazidodi.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7a36f6b51a8869381ce11d572d13c9e2/29934446430.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/wogekexoku.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/morixanusaf.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a413c8ef70---suzujatudejex.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/951b77b57078b5418eaee1449517d897/deloti.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/gotudufavep.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/4vccf1c254seeeu6g4udfnl4v3/domefobo.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202108231714449324.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607140a1424f8---lawedakowilipijuxowedu.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/vozoduvonipal.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210609_0C3404B5FAD8226E.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/88c5996c73bcb60b4e57dd028066b7b5/76555644032.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/dujemiwomopifawozifoj.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/70729755964.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d981db775c---88154492985.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_off0000b99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99E 10660 bytes
SHA-256: abcea4584b1748e9d5bd88ce1892c30a849c1c387bf6bf71d4279a681b92acf3
font_01_sfnt_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 17328 bytes
SHA-256: 64366d27c29da5de5adcdbefa399fc57d36af504500c5cbaeddeb023efa33beb
font_02_sfnt_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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