Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fec5bd0bcb88ea…

MALICIOUS

PDF

103.0 KB Created: 2021-07-07 09:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3c620db2a04a3ed63f3e9df3fb0e29fa SHA-1: 3eff5c3769766adc793a330c12572d377502164b SHA-256: 12fec5bd0bcb88eaedce1eb486c759b63dd5562c27d6c78083925339af3366e2
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The document body is unreadable, but the heuristics indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/fosifefakunorelijup.pdf In PDF document text
    • http://cheers-gifts.com/userfiles/20584161397.pdfIn PDF document text
    • https://ferropula.hr/files/67920572330.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc7040de1---91738164001.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3e903e88e3f70448b2dfc96afdb343af/vebitapew.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/31372566955.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4cac2fbfb---76205898550.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/37ee754137b2f649eea8d151c24af78a/zutunigebalit.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/021a622876b5122298c3df0b9fd424b6/xezanefakomerojowag.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a48e4aabbe317e6cdda066a1033a807/sixonavamer.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c1d02398a4582354562bfc773f4cba28/53283299823.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/1tag10analf41v849s37a8b4h6/20405227307.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704d5e4edbb---mimizakokemofogajile.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bff8a4d6be9---61523772918.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/3752272701.pdfIn PDF document text
    • http://kaies.cn/upfiles/210625190200374347g10c56.pdfIn PDF document text
    • http://myqself.com/upload/files/10290308624.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/1f7ntmcpuc7218aquct4nfhjti/74765395827.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a065832d5---xazumibadunudujugofa.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/e0vk4sq64c4ug5f4s5au1prn6q/mewabemelasafepupuxa.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/bemos.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502224534231608.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5db54baf5fd58e962c0723b626f0e070/kerifufipojivivagupaxam.pdfIn PDF document text
    • https://wagaskar.com/media/tafemutofegezubuwazo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/131b98a02d1cce750c4ae12941cf4896/xabewakukivonexixexufatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+print+a+book+from+kindle+appPDF 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_off00012edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDB 17944 bytes
SHA-256: b0c8414a708cc52ab9c1dd2a1848fd3bc6c8a44897c0d1b648ac3645aa22494a
font_01_sfnt_off00015df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001760d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1760D 10800 bytes
SHA-256: ef58029de323146209740c8c2f21fcf1e80d8878ee154204b432218875590bc6