Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e1d31adbf7149f…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 03:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac359d4f2d55be83683093a9eb0cf784 SHA-1: 14b3d8364b96ce4e3586f038bdd65ab43e5907b2 SHA-256: 91e1d31adbf7149ffda656a1bb2d79fc0528d5aee8f56d5ab9b4416da49ab15f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF likely serves as a lure to external malicious content, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=simpsons+tapped+out+hacks+android PDF link annotation
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wibuwigotifewajabedepojis.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/59766870846.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f5fb2eabb9c7fec6769ad65d714e3b76/3688379276.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790915c1a4a---70815215866.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4d0962r6up4edo599crcsubo55/kigobukotoxojanevifodumo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809605c4ade---pavit.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210523104354.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160d46da36d1b8---67502122699.pdfPDF link annotation
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1d6dfba4---73528430264.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/45144340145.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/556d5e602ca8f50d57bad51e468a27b6/60048018987.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2c8b6jipq6r0odkpbofunfe8k0/gokugenosid.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/43b746cbf99d5c71ebdb9a8fe2d06d2c/pigaliwudavodovofomirod.pdfIn PDF document text
    • https://ferropula.hr/files/ribegusatovup.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a187dc29190---99183839602.pdfIn PDF document text
    • http://bakoca.hu/files/file/winuwavamufute.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44bb1663e4---gujekivugavimamo.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/35525782532.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/g5s93g71mumm3eftn2901dt5j1/42937492165.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/72eaf0aefbd19a626cf6a57e49c8ec2e/70050373373.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_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 17764 bytes
SHA-256: 8dae1ce8050ac00d2ed60323d922329874629dfb0b87055c7201b9309c9a72e5
font_01_sfnt_off00011e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E63 11000 bytes
SHA-256: 657ae639ee80c5b9105acba64e1633444864e1f8b304306f091b937fbbf4fbbd
font_02_sfnt_off000137ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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