Malicious PDF — malware analysis report

Static analysis result for SHA-256 873a114954e171b6…

MALICIOUS

PDF

91.3 KB Created: 2021-07-04 05:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 767bd77e6df889a14e79d3f0c09dd611 SHA-1: 23d8d69891fd83728b3b2ece4037e8df628f2f83 SHA-256: 873a114954e171b67145d231e0d74e11de369a4a4963d387ed2baf04709d9e95
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick the user into downloading a password-protected archive, likely containing a secondary payload. Numerous URLs pointing to compromised CMS upload directories and disposable hosting were extracted, suggesting a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=last+shelter+survival+activation+codes+2020 PDF link annotation
    • https://energooptima.hu/upload/File/77009257081.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2db22f373---36815302897.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/14119304368.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c93e46181bb---69488036191.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3173ec6fbf---rixuxupadukolofubud.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/59c444f58115aa37d5ac9edac5671f65/bibagalet.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a154bc23ff1---dajajitifeponudawufigaga.pdfIn PDF document text
    • https://daismene.it/file/45415080873.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210512172127_1239096289.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fff397070e---30601601492.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160973ab1cc07a---zezovukupufumabavebiwugi.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a52db1c4f---subofililiwifinabab.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/513b737a55269fd9f0a6dc4c4edcf030/71103882379.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095487f24008---98426724624.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccb4642ab3---61153366994.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/xufelitinakar.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/nebenivaxavupufuxuma.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/4b2f72671fb51a943b8f32746631efd6/xobifikefitisewined.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160759e2880133---47722467718.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c781cdf4f6679b137c6cea4d1220533d/bobotokodin.pdfIn PDF document text
    • http://goref.ru/files/file/jotajerizapitaziv.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/96623963451.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1a6d83289---33252684628.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 10832 bytes
SHA-256: f489e4518c6c737fac93d212eacbc56eed27240a6f644b3a952bccc29c3c068a
font_01_sfnt_off0001141c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141C 20264 bytes
SHA-256: 5ea43c5e1ad456dce1f519800370fa9e9fa566dcd387639d0815e5c74e1880ce
font_02_sfnt_off0001461e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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