Malicious PDF — malware analysis report

Static analysis result for SHA-256 64dea02c85ff9119…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 12:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5796a0e94d911a4acf01d99000f63c8e SHA-1: 71849b8acd3600bd0cc96d814fa435a0a4b07828 SHA-256: 64dea02c85ff9119e32baf73d50d01c7290138c5abbb98386d32a1afa665e47b
164 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, with heuristics indicating embedded JavaScript and a link farm pointing to compromised websites. The embedded JavaScript likely facilitates the redirection to malicious URLs, such as the one found at 'https://pistant.ru/uplcv?utm_term=xoee+pc+download', which is a common tactic for phishing or malware delivery. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a deliberate effort to create a network of redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=xoee+pc+download PDF link annotation
    • https://serviceelectric.ca/userfiles/file/56889760611.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/jatoriresesovozeda.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/3792507165.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/refapukivisan.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612f365bc1489---12639305791.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/87504580744.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zerimaferabu.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/boxujosizosexetedajefe.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/jebox.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210916043033937502hy5uup19ces8.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/72776655330.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f8831726---76085324599.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/42264719823.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/96811696298.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/buxadizogigegimufuxexowaw.pdfIn PDF document text
    • https://electroagro.es/pub/files/27332328436.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8ee270c635ae70c192391b74acc36f0f/96089191511.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/16555145627.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/4348245294.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eea446464---13149247634.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/32038959921.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210913025541.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/lekupatetaxatojedavevexi.pdfIn PDF document text
    • http://rc-modeller.se/images/file///62236748544.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210908124616.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/56893353004.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_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 17628 bytes
SHA-256: c3ed656f1c05bcc8e4259e2a22f068dfae025e7ae5de82a5293071c0e8aaf4f6
font_02_sfnt_off000121c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 10144 bytes
SHA-256: b5c5e6a32f35dd45871b35e9b2e9703241f0a06430320783f3c620360fd28d70

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