Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bcd4cb664696b29…

MALICIOUS

PDF

77.2 KB Created: 2021-06-28 11:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f7aa65d07ce698d68af67b4d17e3c3dd SHA-1: 52eb439be6056f7f313c7dad9d42f4baed5e1aff SHA-256: 2bcd4cb664696b29461d340681689a474daf21318e76eb4c93ae5073741a4ee5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://cahayaapi1.com/contents//files/solinejadijipadonigej.pdf In PDF document text
    • http://austria-ex.com/images/blog//file/pubakumagapuw.pdfIn PDF document text
    • http://abpaluso.com/upload/file/jeraxemopavomawatusoluma.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/vamalala.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160759dd530a29---ponixolemopap.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1839baf3---95468271908.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c11602aaf59---92147203601.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/73279622572.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/ditovori.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3192a0308412848709c05d0578e5c81f/forujul.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/udui1plg0hvgmi8nh1fun709b3/3156270489.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/r2q8s2dpgmbkbgqi9aftooumit/zejakigafapeziwijuponi.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/talote.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/mozutunugozowotogasuwuko.pdfIn PDF document text
    • http://carszana.com/image/upload/File/873718736.pdfIn PDF document text
    • http://altinay-law.com/images/file/78446567179.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/fajewuvesokod.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afeb08224b7---verulejunosaz.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf91909183---suzuzozuduw.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k5k3cfr761i2ap9mh1cvbgjg02/21494691599.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/52c5fbfd668909747335d63fbcf7c3fe/24167204597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=geography+as+a+science+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_off0000cccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCC 16256 bytes
SHA-256: 69e8a396c6f1f7df1ce9238502e9ccdd7d1a92b84cc6119128763f7c4a160b81
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 10908 bytes
SHA-256: 6cd68e94345b5a12229b448bd068fe50476cd1c6ed77aa4ea5c1b606eeb95f8a
font_02_sfnt_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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