Malicious PDF — malware analysis report

Static analysis result for SHA-256 719fd7f162cbece2…

MALICIOUS

PDF

92.6 KB Created: 2021-09-01 03:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29e1a7337792e2b53c17b3e299116338 SHA-1: 094a43e36f9e02761575a8ffd848f40ac0d93cca SHA-256: 719fd7f162cbece2a93ff45c50d4ac23e777986c5764cb25e5366ac0ff40f349
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the numerous links pointing to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=olympic+weightlifting+program
    • http://winso.tw/userfiles/file/36608378695.pdf
    • http://solemarservizi.it/userfiles/files/rulalazijafofovo.pdf
    • https://taevlingar.se/images/pages/file/3990091838.pdf
    • http://stmrcstvm.com/userfiles/file/53178905030.pdf
    • http://weorderfood.com/uploads/files/mefavumivepotem.pdf
    • http://quimicahj.com/admin/userfiles/userfiles/file/74345416393.pdf
    • http://adamlegal.com/userfiles/file/jusopajavusitikabototipe.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/cmr64e6127u3i2vmos8evp0dt3/xuvurikezitanojoxupewo.pdf
    • https://pachetedeturism.ro/images/files/7635599150.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/f2c4504acb68990bc02b10863cfa22fa/doxubapadi.pdf
    • https://redac.ch/upload/kiwumesovexomaw.pdf
    • http://amirafouad.com/uploaded_files/file/kamawotifaramufob.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d25e82ee5---29059219619.pdf
    • https://afra24.com/basefile/afra24/files/tipujibemotegemekegowaked.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/5ojis5erijifhs7p3o93r8tl35/sinezifibiw.pdf
    • http://ecogestval.com/userfiles/file/55631131855.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e4ea8a0ea5638c74369e99f7edb9c41c/bimatike.pdf
    • https://capital-tic.com/upload/ckfinder_temp/files/20210605021759.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0279b84d5---45282850143.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ig2b0an3btn8hqhl1dgq8mmrio/69470449104.pdf
    • http://proxima-design.cz/files/file/1659124904.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091d05e89579---jubefusut.pdf
    • http://wsp.pl/userfiles/file/febuwuwasixesu.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_off000102de.bin
e6791ccba7500ae3700dbe5d791f7d9254d8a50b11537fe46fde2f08cadb5038
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 18496 bytes
font_01_sfnt_off0001332f.bin
3a95cd2132037412aff0eeb0e270169e268ad3b58268dab264fd644e68cebe03
pdf-font-stream PDF embedded font (sfnt) at offset 0x1332F 10984 bytes
font_02_sfnt_off00014c99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C99 16792 bytes