Malicious PDF — malware analysis report

Static analysis result for SHA-256 a063c4c28d670bb4…

MALICIOUS

PDF

72.2 KB Created: 2021-09-01 13:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c626ada26d0aa150c2ef2742bfd68c18 SHA-1: a68d6040e82fbb5b2c817e89cabdaa4eb051e609 SHA-256: a063c4c28d670bb43cde64b4a9669338d18eae0034fae1e379e5917dad1abcd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites, likely for phishing or malware delivery, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://5udua.com/contents/files/rinipukofuseser.pdf In PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/ij9dqr5l2cd9djdv2kvhpni749/wonasevanijupoki.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/51924870161.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/putofolosawaxurasuru.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/33525413821.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nixerinuxufukuvodog.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/67689348945.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-29/images/files/62232851395.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/pevuga.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1612191399f5f0---fuwepajoxunesubof.pdfIn PDF document text
    • http://kmsenior.org/file/files/96601275707.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8a65ea9fadaed7d899a1b68b7a44f88d/69258843110.pdfIn PDF document text
    • https://geniodelweb.com/file/21336886698.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/86270896938.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/94219017902.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/wajizidejisanegid.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/zugojuzumejazame.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/7478578256.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/9rc6h1jmj6cdb76haa8t5d18pv/83177482731.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf920476cf8---52472975712.pdfIn PDF document text
    • http://starsunited.at/upload/files/27690649980.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f23472e8937bcf85deafd8bf9ec9c6e7/rakisusepuno.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/48496054598.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ff18280e5---95853152063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=school+counseling+scenarios+and+answersPDF 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_off0000bc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC58 10812 bytes
SHA-256: c32178e849642ebf36293965f905dc0b1aa6ff42b554f7361335e923eb68ab62
font_01_sfnt_off0000d507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 14768 bytes
SHA-256: ee02d82d2eeb0c90d5c6cf2411ed504adae1e0a3ba308221e362691c0f07d752

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