Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf33215480b5d65…

MALICIOUS

PDF

85.2 KB Created: 2021-07-07 00:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be494b528fc64892f76e309643a1755b SHA-1: cb6529207a78d80c30874cba579402a93212b989 SHA-256: ccf33215480b5d65e3d8fdc4139561a40fcaa7109701e915d688a7507a59a937
176 Risk Score

Malware Insights

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

The 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 pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The document body was unreadable, but the presence of numerous links to PDF files on various domains strongly implies an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a722798385---29104345892.pdf In PDF document text
    • https://walkandsmile.com/userfiles/file/rolefejewulavov.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/dejiwifedexopabiraz.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/sudevuvikamifirorezepo.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b2ea8054---bedibudunezexaxenaru.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e754e374d9---43214650892.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f632f0eda8---6765834988.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f641c138b2d7b60e3b7213839056d6fa/78424088937.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/lgmnlki981q86gle33e6g4mode/tepowenuti.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/fevajekuzotadazizisojela.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/vigumakojimebijugadi.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607145bb89174---vubudexokerosivitofikoten.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c061427c3e2---mizup.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8b91111c26c6d59fb2f780042564049e/25952445527.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f7fe3a13---somunidakebeki.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/99837369972.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866753085a0---31841694385.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd4d2c7a70---43184919110.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c94e8ab29---katelanefusikodibe.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/9784799585.pdfIn PDF document text
    • https://aedwea.com/upload/foto/ravopoxabugajusar.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/lalupopo.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/vulumugopopimimilite.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8ff215a1---jamananudofibidazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gac+in+water+treatmentPDF 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_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 17176 bytes
SHA-256: fd237e83cd9ac98e40b637bdd31dd832342e5eea687d64a5322ff31dfe1de6af
font_01_sfnt_off000118a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BA 10184 bytes
SHA-256: 41a48deaa5684a50b1f67a880525cd1dc5d4ea6eff841524e9e143a1be83a61a