Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa063fdad51f4ac6…

MALICIOUS

PDF

108.9 KB Created: 2021-06-28 22:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 81ac80b94acda67e4ecc4eddd30208bf SHA-1: bad59543f14021d04d941b4f040838542c55a23e SHA-256: aa063fdad51f4ac6f83011bbf66f496efa6b686d9b12aa36a7b0a34b378977b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/582ea4c350ab353aab37ef3e248d4d28/denidaziz.pdf In PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/5195589296.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507133412429820.pdfIn PDF document text
    • https://ubranni.com/uploader/files/poduw.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/91288025986.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/52575071925.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a38e41d9ba1ce37b069e5034237e33bc/31671119420.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/bkdvenl9kq6e0ejaro1jfdl5n1/burinufunap.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bbeaa62f0---93744262651.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9hajd965tooob40os96e440ij0/45220677710.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608473075f994---zomolaminakeduvanisi.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/sufarategipi.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/fdb7ffc32807790b649dd9877d486ced/97781328375.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff8485c330---95160499784.pdfIn PDF document text
    • https://digireg.com/upload/66188267176.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7144a6f5e5---23215429000.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/44654743411.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/8dt6jqnc0850rcfadhrdi55dpq/24543304835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=meaning+of+on+the+spur+of+the+momentPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015ce7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15CE7 26012 bytes
SHA-256: 60fbcbf643b3a3e88bf1e2697e2a4747a4ba34ede665894aad0dd3d89965accd
font_00_sfnt_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 7380 bytes
SHA-256: 60c5b2c247838ec03994b0550036facc284099db5054edddf175e08294d17187
font_02_sfnt_off00011701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11701 29688 bytes
SHA-256: 1fe51d2230c84675f4034feba2ec12e88290a45eee12bc6de5a52ad41be84a1b
font_04_sfnt_off00018ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CE1 10852 bytes
SHA-256: fac0af10731ef69f53323a0ca02f52408824a1447dc9029800aaa8e9118ab375

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