Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafe0df78a191c64…

MALICIOUS

PDF

82.4 KB Created: 2021-09-24 05:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19190e69d2e154bad7dd39b20cba96e3 SHA-1: 2d71a48b3c4abd02b5e9b4302fdd7711af2f0a32 SHA-256: bafe0df78a191c64a4888c3cbde7ee924ed9e17b0a7388ba1141a5ad34460fd6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file exhibits multiple indicators of maliciousness, including malformed streams and a high ML classifier score. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the ClamAV detection strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://synerhu.ru/uplcv?utm_term=indian+idol+judges+names PDF link annotation
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/54679961249.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143faeb9e956---85418803820.pdfIn PDF document text
    • http://balalajka.nu/media/74246332961.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/jutovupubegisavilud.pdfIn PDF document text
    • https://intersat.lv/files/file/24440821030.pdfIn PDF document text
    • http://synphabase.ch/upload/file/jezajugitefokujela.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/mepebejetawewonovupijeg.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/28989328266.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/mebemuvotedotexeli.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f101a5c76bf71b4bcc8d5088f0c72b21/41462967675.pdfIn PDF document text
    • http://hoogbegaafdennu.nl/userfiles/file/digigugajetutonokeba.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/33338864067.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b04b8e7467bfcd2f45124f33f6aa807a/54108995178.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f73fe7f333---fuxizoxizufowujogimi.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/21515699202.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/46242418067.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/15050451272.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/50773797726.pdfIn PDF document text
    • http://kleiberit.ru/files/file/43743017934.pdfIn PDF document text
    • https://digireg.sk/upload/4020711756.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/56344864774.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/75057358817.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/53583979104.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_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 18276 bytes
SHA-256: fef836ce122ae9e1ed68dab60681fff3d3ce199c399d4509414bc867605cac40
font_01_sfnt_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12439 10572 bytes
SHA-256: 645d29ba688ca29c03abebad7c024296580622d3f17f13b48be6bec51230b8f3

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