Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa270a8821dee84…

MALICIOUS

PDF

99.7 KB Created: 2021-09-06 07:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d189405050ff18771dcc0af2346f214b SHA-1: da23e9040f401799daf24ca331d450c5bfb567da SHA-256: 2fa270a8821dee84843b8d35238b8ee0011509d7a580ba571c3b8d2cebcc12c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. The presence of these links suggests an attempt to lure users to potentially malicious content or phishing sites, aligning with a spearphishing attachment attack vector. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093d11ba09c0---kuvopipuxakivagawibiwil.pdf In PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/pagilozu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57aad66cd---27095929710.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/k1soa7l797ol3k6t01ro7q2vpi/tududafime.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/vexazivitogadovu.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/tudimuwu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea720def0---xomixurib.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/30aamtvib3n62o2qu6ubgrqrk7/70223873088.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vofefagemipuw.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/31822087547.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/82c4n7fusarhubifg6idok2fee/67179176567.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/74528953763.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1225e181c---40194938442.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6270ec2f0---28659847338.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/retevotetumezimarovadu.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/kinunujabubeboxomup.pdfIn PDF document text
    • http://canadanur.com/resimler/files/xisorolel.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095dd1b08a01---13642614623.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/piwotujotowum.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/wonuxefojejoxitarup.pdfIn PDF document text
    • http://gardatrans.com/content/Files/9912498230.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/46259136568.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7042fd9dce415c1be57903bc36e1f013/28521362656.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/zopavetosibanafiwujul.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/70e3a4370281c4ec4e5411f051937703/3922202380.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/nabaxa.pdfIn PDF document text
    • http://kasargod.net/uploads/file/92608395869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=knowing+how+to+know+idries+shah+pdfPDF 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_off00011ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBB 18532 bytes
SHA-256: 19f4471e4ba204f0c4192f1025015e07eeacc60fdb69cf266053f98036d7dd06
font_01_sfnt_off00014f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16740 10900 bytes
SHA-256: e6c2d0989b71092633a4c050d9bb030b0bcf62661680d37bfeb3244107dad181

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