Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a61581b6b4223f…

MALICIOUS

PDF

80.9 KB Created: 2021-08-22 02:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e59a0ad84d6e10a103f42f0d3a207184 SHA-1: 0c9f5a1f23229368188e506e8f14632188923781 SHA-256: 11a61581b6b4223fc9c7c885f2416c1bb0ea73da8b59dccfa510371f8b77b879
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters further support the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://thefertilizergranulator.com/d/files/60009052860.pdf In PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/928d62830250fda35eb1ea2411a799d5/sobogarawuzejevusibop.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/zololemil.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/0d66f4486c1160fa7a8889d4e019d73a/dokuwakumolonoroto.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160704518c10b8---48294763963.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/rijozepawanu.pdfIn PDF document text
    • https://petikdaun.com/contents//files/21802807550.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/ee564c83630d3e7f3c78d98c89c23e34/7738339412.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/limoxagasofopirafapuzasa.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/180vr2fkcov18ml83ne6ssdau8/rumesisetesifa.pdfIn PDF document text
    • http://topas.lt/userfiles/file/2887570769.pdfIn PDF document text
    • http://montesantangelo.it/files/files/kunatimuzukoromibefuk.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/60587675036.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/nokudumuzudo.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/ae72l1n8if60194vomt14g3c54/64251939478.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d53db30b82d---78739869557.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/gubodonirilizubek.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/40410240403.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070505e52ede---fopeseberovexozegosuro.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/ribawaza.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/89749382651.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/91732392866.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/55415828263.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/butexetuxamatefovot.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2237b2c5---baforimitesod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=do+water+beads+work+for+plantsPDF 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_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 10716 bytes
SHA-256: 91cde6ee8a3ee5f19f5b890c55b0bcbcced0aada4ce972d71d2f456376d159ac
font_01_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 15932 bytes
SHA-256: 568897a4af6298e5cb7c8aa963913401679c568d54db259e2c6ecffd3cbdc82e

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