Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac7de15aa928737…

MALICIOUS

PDF

88.7 KB Created: 2021-08-08 01:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: cf4379c0613d1761952b35c921318f04 SHA-1: 4b64349cc6ebbb06d7d92a0507f3b2cbc416f596 SHA-256: bac7de15aa928737a088603e56f10b3baa73f5448a5cc29c6fa31719396a820b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=ejercicios+de+repaso+matematicas+secundaria PDF link annotation
    • https://reparationmobile.net/userfiles/file/sodofomilolavubiw.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/busunubewezegexesopix.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba84bca98ca---38632955698.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/bc4aa7408ab9e9880b8165f8c5ba9978/xesikekagedufasuxa.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/8b33b8d76e55357c5c4723421be3ae90/fisovugugedizig.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4d4101643ccdf3afabd750b07efeb657/27708720852.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/ziloxekuwofolaxumomumo.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/72442301846.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609b589545ac6---84278251087.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/87771427901.pdfIn PDF document text
    • http://mp-journal.com/media/file/gukexevodipusazabu.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/69658529609.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/borunuxezezojatilojex.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/11732369008.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160790ecdc25d4---funatofura.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/96760352302.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97f3818e0a---joxigabobogonojexeginem.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/dd6c4e84cab1bdbcd148b4fc9cb7589e/28644668469.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/jefirawituledotimirabijum.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/dapetowimipa.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/q0cc23i986umvpdcle9qq8vbd6/binip.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/84804048438.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/634bfbab719a585677fd88bce1f00e16/55694427466.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/bunukexiwafemu.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_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 10840 bytes
SHA-256: a56f912a61623f1cfdc890b8c1f4eee9cf68069fe603c1c52d4bb9c6ec239f92
font_01_sfnt_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 21280 bytes
SHA-256: d71eb130fcee50438e14a2cc4734b6141054680ecc8fb6b6e5a70b0ef385e3e4
font_02_sfnt_off00013abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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