Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cec05abf879040b…

MALICIOUS

PDF

81.6 KB Created: 2021-08-19 23:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2033ec2694778bd95d6494276f5f5b05 SHA-1: 5dcca841cb85b5b3131745af25599dbd315912a6 SHA-256: 6cec05abf879040b41977ff48aa5b0d75adc6c444b32538ea2ac1390baf91e5f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of a link farm and the use of compromised CMS upload storage are strong indicators of an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://airshow-bg.com/file/5127308576.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/765d014701873e1705b46ee45d7005fc/53945341568.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/b091cbdec103ae03de0d5f4082ba8879/65280471943.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/60825426673.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles//files/47599888719.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/32246164256.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/77801388847.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/geb2g3257mp66qpv24g0fa64vk/95988579729.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/80586100605.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070e92a77ae9---retaki.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/41465547730.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160717ec436afb---69620164832.pdfIn PDF document text
    • https://lesura.net/userfiles/file/28829006868.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609db20919953---gitenevovegurek.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f97c0cd3f3---gofamibibogogimok.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805abd05f75---guxugemisurosajigizix.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087204458280---73475390290.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/55549844795.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/8asn8786if9098glghe3bvjlg8/55396247419.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/0d4533222156fb69e2e52b60c1f24bb5/85050113803.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160882125f386f---vavujelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fortnite+download+unblocked+pcPDF 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_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 10736 bytes
SHA-256: 57924ac7012749e1312aaf349ea2d064bc97012a8db541c28c64cfd4ef42d08d
font_02_sfnt_off00010bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 16868 bytes
SHA-256: 13f303ed4c30d84ac9606f2968891c206af58c4b570048c598b2b69f68009efe

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