Malicious PDF — malware analysis report

Static analysis result for SHA-256 737d9895c2373a65…

MALICIOUS

PDF

92.6 KB Created: 2021-07-07 08:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8f6bc9474eb3a47b75c56a904469878 SHA-1: 56b846323b6b901075392808e72910b53864a249 SHA-256: 737d9895c2373a651c99fc64cbaa21cdbdc202fc61c8e7b81d8e45ad0df5046a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple compromised WordPress sites, likely for phishing or malware distribution. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic suggest an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://archism.ru/uplcv?utm_term=scientific+method+of+research+ppt PDF link annotation
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4cdaaf7a9---kenuxi.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba67d6018---zumimutipugalaw.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a5287341a---38123735077.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eca7bffde---80150639785.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607650d6b87d0---gomuk.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/baliweredawu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5d684fa33---vumibelugabamibiser.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/305fc042cf9e20a796ed761a9945d596/batamelobevajowit.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/pixamadezuwemew.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/53237352399.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a279cf8d5db---vowoginuredezixumuduzo.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/65414108259.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/komixawimomiverorofavurut.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/abdf1f06aef4a7486d245e1ae052ac01/12393838046.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/bidulugebi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18sq31jb18e2cqd6hal9jrui32/notepafomiber.pdfIn PDF document text
    • http://sdds.be/userfiles/file/7000971200.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tmrpsng3o5l2niigkmj7mne8m7/43984927249.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/95007260886.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/8322273839.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/nuwisaxebanuvituwepakog.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940eaac5231---35825115709.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0602715f4---58976491095.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/010c176db9251a38823c2f74f50d8e88/78760029168.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87daa08af31a48add6b515738a552bea/kawoju.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e71a0459c8---15242927473.pdfIn PDF document text
    • 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_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 10912 bytes
SHA-256: 84afd61e319d8dc1fab65d3be2f94ee6bd1b6d896de4ea65fa311b11876fc157
font_01_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 17440 bytes
SHA-256: cfa34b5cc992f97963e790bb70886e7d416d98ef93bd6b7d74f7be39a503d540
font_02_sfnt_off00014af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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