Malicious PDF — malware analysis report

Static analysis result for SHA-256 817a8b6559fd0438…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 21:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68a2154ad4a2cc96eba0764097069d26 SHA-1: b3df7b72fdb6c7ca32b39787ab08bab5397cae97 SHA-256: 817a8b6559fd0438944cf7313ce895ed6478c89067437c60c19a0912f6d50818
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/21tn2t5eg55mdjhpgmvhuqdud1/90577015992.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e66f786836---kejuveminosabupuxetis.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7146c25bfe---86124951470.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/paxerur.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/lexilapukolipa.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/o5hau189u9ou5a558vpn43dls2/gabemabixizupukosaseragu.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/fujezizavulibimogabazadab.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/59366149370.pdfIn PDF document text
    • http://premium-h.info/files/files/ladowujotugojif.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/lusuwitilup.pdfIn PDF document text
    • http://pactolous.hu/upload/file/93193346102.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a185fa110a3---81676973556.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/78579515264.pdfIn PDF document text
    • http://hasyo.net/files/file/xuxozafuzu.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/26846674183.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611935f62fc27---35742771533.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/vaduziwikawuba.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/96a451e4f6832a051abd443fe28d135f/mizurozupojatomixewo.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/19876350041.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/61037942444.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/32630dd23b2d944d07ee8af6f817c5ed/17236693472.pdfIn PDF document text
    • http://boldogelet.hu/media/labupalapusejeseselixiwug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ironmaking+and+steelmaking+book+pdfPDF 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_off0000ca1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1B 11024 bytes
SHA-256: 3ba2eb179159fd798fa9d8c5d4a202a800cedf1af2001f4235e3aa35b9516c6d
font_01_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 16912 bytes
SHA-256: e09cd99e6c9c35895670053163ba86b624b0f146ab3d28fcfeae01bc8bf5b6b1
font_02_sfnt_off00010ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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