Malicious PDF — malware analysis report

Static analysis result for SHA-256 5059ee0ac38ec2c3…

MALICIOUS

PDF

99.3 KB Created: 2021-06-30 22:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8de4dd27c41b1bdfd479f3a14b651ba6 SHA-1: 0da03b899f9ca7baf7f7fff518ebf6973f669bc0 SHA-256: 5059ee0ac38ec2c30c05263052a5505aac014f1ee1a243eaca8d4e81b26c21e0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=1+thessalonians+6
    • http://marinapogon.pl/upload/file/polasurumopekavuvozurizeb.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089eba28c841---gibebofapimiti.pdf
    • http://przedszkolenisko.pl/userfiles/file/73123722783.pdf
    • https://emmaushuis.org/pages/nexijuwazefegopugaz.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad806cf41f---2438197769.pdf
    • http://mai-colle.jp/userfiles/file/13480210875.pdf
    • https://daotaolaixesontay.com/uploads/file/kijekexiko.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc75b153ba7---16694995303.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607085e055664---68141736641.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fcf155ba7---11030574710.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/95e81f94ace2920adad7c8edfc3832a9/rimufumidefubomesofobon.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/330580013ad80643c1f0314df41c62d1/bawowuxonemelun.pdf
    • http://coumert.com/images/file/2895134259.pdf
    • http://loveperfectionschool.com/upload/file/xiloxa.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a947d0cf8eb---dipubafazokezeram.pdf
    • http://videofilm-tv.ru/content/File/72413097852.pdf
    • http://abwgulfport.com/uploads/files/fefipeb.pdf
    • http://sun-green.de/ckfinder/userfiles/files/vogezomo.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/km6jd4qjv7654hg40aaelqn056/vexefop.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c3376955171---wawaridazukasodadub.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cee45a64a8c---pufunop.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e57acafea7894174cc83c75d098a5e3a/18028857782.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c40.bin
426e5ba33e2ce405cac654e0387e8177d9dcdd2ed376daeba09baff136acf3d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C40 10228 bytes
font_01_sfnt_off00013336.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13336 16792 bytes
font_02_sfnt_off00014b48.bin
258dfecf8ab0d7bc21ebd2bd975c4eede02f1867188968b431e4388f11a0981a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B48 19532 bytes