Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8f59e0b1dad777…

MALICIOUS

PDF

89.8 KB Created: 2021-07-31 05:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 334775fbf2dfc9e482b7afaf6e14edb5 SHA-1: 1b0cf2902e5ea96921b44437bd5619eb002dacff SHA-256: ef8f59e0b1dad777ab0961879da89996ba7cd96b84eb7298e6d3ed705c0863b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The document body is unreadable binary data, suggesting the malicious content is not directly visible text but rather the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ceccarbotosani.ro/userfiles/file/34405689055.pdf In PDF document text
    • https://eletmodguru.hu/files/files/vusukonadimeduxedopo.pdfIn PDF document text
    • http://c-amc.com/upload/files/95773007819.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/81225900639.pdfIn PDF document text
    • http://kezmosas.hu/files/file/jasirijowopapula.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607632aee91e2---nolifu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc82cb3fc6---vanidasaboweludu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cac06c67436---22879407895.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/zagilinejawosigedutibe.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/vasebotoxolijigedunexavuw.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/nskktant8pbsk7gk633gre62ne/48174757196.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/lolegajiluginofulisipenim.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/wumoxavevor.pdfIn PDF document text
    • http://jar-ted.pl/file/rorinopoxikudesoxazavokud.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b0444f5b7613c181dd4c76083077c044/xijodozejisuwebudinopanuj.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/63477657155.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/161e5142054d07044eeea5b12e825008/13354072382.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/1244380736.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/97415713465.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/f7cd594f1fc17358e11adac2f72b7f02/58897692617.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210720222403021.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/83932705716.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/vojararuvebowodebozevariv.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9805c1290---57099213550.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb968e742---18428803730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+long+does+a+landlord+have+to+evict+youPDF link annotation
    • 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_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 16960 bytes
SHA-256: b0d8d98613b23b12fa59402a33258a578c079eb2675785e9d4d5c040eb72e0e4
font_01_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7C 11008 bytes
SHA-256: 49e4aea10b12a5da283d620192af11a2897dd6f904e6518ab668352151531a70

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