Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64a647e608c12f2…

MALICIOUS

PDF

101.6 KB Created: 2021-07-06 16:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 911902d924c7f4d7f64bba2e7222007f SHA-1: 9629e8d9b382c4bfb0cddade989067daaa2917f9 SHA-256: a64a647e608c12f261fea67f21491da7df3aac9e68c43d2057cddf22f3fd73cf
164 Risk Score

Malware Insights

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

This PDF 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 hosted on compromised CMS upload storage, suggesting it's designed to lure users to external, potentially malicious sites. The presence of numerous URLs, many pointing to compromised WordPress installations, reinforces this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13e0016632---61719490628.pdf In PDF document text
    • http://indemo.pl/Image/files/95059389413.pdfIn PDF document text
    • http://oicenglish.com/imagexx/files/6335835971.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/67416368034.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/c44c7e6af2e82626bc01a46fa3ffa1ae/55820822148.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/88029156589.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160743281d5aec---4384416000.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/43603838685.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d321d72284---29842336679.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/menirufetiwi.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/91785959040.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/supidezewo.pdfIn PDF document text
    • https://activepymes.com/pub/file/6504133010.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f70df521---zogidofevofop.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/27687597847.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607492075aded---7589974914.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/kqg9qrutjorev2u3t9srielr42/vefaxekigezowigibafopar.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/vfg6ut7rtjqh8i21ij4b2q53mb/xeganulajam.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/gezamives.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/58521584474.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/79a4e2d11697b21dcc9e53a4246e516d/17383001850.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/871f4f5829dfb3e9ed4437ce91d8f4be/kopoteg.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800a9a9cac3---fanutur.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/841788e8e3453914d74c7c0532dba2e9/16931879968.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/65741265709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=rediscover+meaning+in+tamilPDF 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_004_off00014269.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14269 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 23736 bytes
SHA-256: a65e07abc2d9d08cb64e9fa7f9d2c5c04239c0d57f6286617bccb79968297d8c
font_01_sfnt_off00012a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001600b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1600B 10824 bytes
SHA-256: fd6619bcffd95f4fcb35f19f53bb9285e916c4e54f6577d32a57c803a9345cf8
font_04_sfnt_off000178ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178CA 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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