Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93bb27ca0a89157…

MALICIOUS

PDF

86.3 KB Created: 2021-07-14 09:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de0a73ef3acc0a93b38789099cd58eec SHA-1: 12fdd631bb9336407106a4164003e3bb90106a8b SHA-256: f93bb27ca0a8915749d16e1af0b636ef021f951f2322b2a143adb16e4aff1a07
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to obscure the final malicious destination. The embedded URLs, while some are marked benign, are part of a larger infrastructure likely used for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2475aae57b---zatumafumukolonivi.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/41789007013.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/tafutumexirabeti.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/fajiduzub.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/m9cdnkkmseo78fl9q1fm79n0ja/nevofiteziwivubi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e198d72af---56223550823.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/19bd0ad63f8007112f3c4718d5398c58/68920457261.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/78066897963.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071467057b1f---gomuzowule.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608068d4b2809---sevabub.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/87781146750.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/7f6ikma8shfkanmcf4kp4qm1p4/gepemavujozoluzedokovana.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd03fa4a328---53447285729.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/39650629289.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdddf4e93a---gobivapu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49e573a61---45920884066.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/38553114210.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/28080101186.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a7a6eea2c---39837681672.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/zenuvetitujesite.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/pokawafozojepemazowabuli.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/pipakoramigasipidowuf.pdfIn PDF document text
    • http://iphysiology.ru/upload/zuwovilinobi.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/dfc0ae6e911139b6f8699f17ab58c12e/92660474217.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828dee688e3---xaxisulipujipedot.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dedca31aea2---20673266127.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/12295228706.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/40381660019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=when+a+newborn+is+constipatedPDF link annotation
    • https://medlineplus.gov/constipation.htmlIn 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_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 16772 bytes
SHA-256: c91c304d65cb2bc619987a119e0af145537ff9404d133c5d827a7bdc0eefa2ae
font_01_sfnt_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001330c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330C 10784 bytes
SHA-256: a6b2916fc6d3a52abfa606d93ee657bef5df1548c74988d19d474ac0a134ac34

Open this report in the interactive analyzer, or submit your own file for analysis.