Malicious PDF — malware analysis report

Static analysis result for SHA-256 5644a6ffa114f3d1…

MALICIOUS

PDF

99.2 KB Created: 2021-08-14 19:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6b4c77dacc18adae544719c3710f0db SHA-1: 0c819e505ed88bf5e41108d8905852d711217eca SHA-256: 5644a6ffa114f3d15055127cf44096ee9cb47a8529a932b1a03f928fae8f6b80
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised CMS upload storage and disposable hosting, which is a common tactic for distributing further malware or phishing content. The presence of embedded URLs and the PDF structure suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e20696989---fozesi.pdf In PDF document text
    • http://mazdooradda.com/userfiles/file/4830511915.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-28/20210528010412140097.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7b385725---12290809289.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccddd26044---81770459857.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210629211059.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/d3b7fd6d3b61ea472c14f634a5cef526/8411083470.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/21266752534.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/rodoxasivutofe.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff9bdc65f2---98644862189.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5e78efa68---53808314589.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/cf2992c84c4a2335390f0c4bdba8ab17/nufamabegelejifulez.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeac729895---24497150449.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b758370220f0132cab8846ccec8be7f4/mexoma.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/nuwibigulu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d97239fa---74785126871.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/e6444bcbac4b95b9dcffed9e61334a5b/bililoloxezigusubo.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/87d037306446d91e3761122c29cf1725/44458761297.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/turabozomevafakuzodewil.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd15f4de5a---41734937697.pdfIn PDF document text
    • http://change-sexy.com/files/files/jasafexoru.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/lujovig.pdfIn PDF document text
    • http://accronline.com/userfiles/file/lejumosolabizonimafosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=craftsman+c3+19.2+volt+lithium-ion+%26+ni-cad+battery+chargerPDF 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_off00011dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 11276 bytes
SHA-256: 5e3661f3d27e0c27fadb6ae5ab0ae3a8efdcd7d549ec1f5aedcabf01ed73f598
font_01_sfnt_off0001384e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384E 17872 bytes
SHA-256: 56353214e91e4cf419b804567013fc4b85f02997979d08eea6e3aed407951a55
font_02_sfnt_off00016784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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