Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b54dadcd1af8f5…

MALICIOUS

PDF

81.9 KB Created: 2021-06-12 00:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 632ec82774a36ec0ffc9fe5bda6dd25a SHA-1: e25406561400631cf603060e90434e64cb61acf3 SHA-256: 85b54dadcd1af8f549de1650eeb79d510cb8339cc8018089a296ee77230115f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body and extracted URLs indicate a lure related to 'download followers unfollowers pro' software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crysiq.ru/uplcv?utm_term=download+followers+unfollowers+pro PDF link annotation
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/faa66f6abf197ca8f7b042e60f79e2d1/62096052568.pdfIn PDF document text
    • https://peterdegendt.be/file/64637861635.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a753010b621168ec31f068183118a0dd/4663270060.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/74145745926.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1c58a539e258b9b63e136c731add1226/79677206576.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3a44e219a---81736145302.pdfIn PDF document text
    • https://laser123.com/geektic/files/67566997338.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e3553a913---leposanilopaxaru.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a127bc9f6a1---13002360526.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be3f4785ef6---nesotepodasov.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/83759264395.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/94595786419143283b7e4fea0c7dda84/latat.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a02549f1efc15b22992a7333cbb1da18/faxabojew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 5128 bytes
SHA-256: 0e58362ad85f2c709ed3be31f394494688392afe2281715e27aa93e907ea4263
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 12152 bytes
SHA-256: 26c5dd661bbc9566a7343cebe4fdd689ba6e72f53efe7b9f6ac1865714eba8e8
font_02_sfnt_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 16168 bytes
SHA-256: 0216150ac0e5ade23b072752459620ec704bdac01526bfbadd96d51f96873ef3