Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc3812cfe89e626…

MALICIOUS

PDF

73.9 KB Created: 2021-09-05 19:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cfcbe97eecc4d8a21c159178ff7c12b6 SHA-1: 8704adcdc6cd9eb879d72f6ca5d9695e751e3dc6 SHA-256: 4dc3812cfe89e626c5ab044b3c5f74b930a9ad60e4a737767735d11dcbbebd9c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to drive traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=materialismo+y+ciencia+bunge+pdf PDF link annotation
    • http://novussiteyonetimi.com/uploads/file/30737504467.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/4270469487.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e01591e25---5753158927.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affcc56ea45---77959586134.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/perorapopokukakepuxen.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9562d059d9---55486018264.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/perixiwumabepaf.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100fcfb0d0cd---burizimekegeno.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/xogidaderuv.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/mixizojoxasukuve.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b15da9e10d---jodemaleponovujasowe.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/bepus.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/c2kdlfpnhdb9gpb6iv54nvnan4/tapetudolexuzavizir.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84f678ba9a---32630837838.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075ef6d9ec0c---bivabubetidusujumorokibo.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/pobiluzotemanuzezom.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/koruwabo.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/99522649847.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/bavijagojupovivavizo.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/45336824578.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0fe2924a8ff6858e38cb564bfaee502a/zanenuvul.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ea0696de998a5cb59ee4059110b1f667/33181797895.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b48a440d789feb5cfc7fd838f4771aed/81573567467.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/fekejakapidewava.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_off0000ba0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 11308 bytes
SHA-256: 0af98c6ee1b49455a23925eacf721991a49bb9c14f7649500bc3bf514f6d67f5
font_02_sfnt_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 17700 bytes
SHA-256: 3e26c6f458ba089a3e1d22ff054d5d69c7cd63c2c4b6623458b8c60cae156a2b

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