Malicious PDF — malware analysis report

Static analysis result for SHA-256 961d337d9b32ea3e…

MALICIOUS

PDF

103.5 KB Created: 2021-09-07 05:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff8358ca6775793dcf937db5e2c5973a SHA-1: e32c8d3e02f3d1c9886176f374af6bbda521fe89 SHA-256: 961d337d9b32ea3e965bdb941f2ef38c270db366ba0339bbbc79d119dc677d80
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://vswet.ru/f/84987223694.pdf In PDF document text
    • https://dienlanhhonganh.com/images/pic/file/42213337141.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3bc05906---42213754680.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/22137831543.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/b5e877a19d776aa11f2e1755a97222a3/nujomariwimufibixixuz.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16081000b22bfe---zirikononotarupo.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/forigamilupagejuwuxube.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162753900174.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/beromuzalafufigoriw.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/6641086726.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/19788526159.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbca25381b8---jifuwadefopuborakox.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/47151252003.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0sftn2f3in25cg0o6emo1j4clb/losalewazuxilefoxini.pdfIn PDF document text
    • http://abnicum.ru/files/file/36893838421.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bc35a39b4---61454591844.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/11863999220.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/vejazipojopanagizanabom.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b38facdee---23166348500.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/26567750037.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/62544344490.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c5db02a9c38---97407320100.pdfIn PDF document text
    • http://haphadoor.com/upload/files/1287482937.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/4ej3ruv4bs30g5kjs93djakpom/59022774877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hogan+assessment+questions+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_off0001309f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309F 10932 bytes
SHA-256: 68bb1c8fe1b2fbbf1d3f4d73e9a1190aff6ef7a495e75a39832e4214cf392008
font_01_sfnt_off00014962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14962 18108 bytes
SHA-256: 0a31361819b88e2eb7207211aa6e321dc60934598bb1193f011c3daf256d4f54
font_02_sfnt_off000177eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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