Malicious PDF — malware analysis report

Static analysis result for SHA-256 b168221821cfab98…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 20:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 996add381781e21d9d0e90b34bcda92e SHA-1: d8d66785ea41817210e35cd3a9f7bb77403b5efb SHA-256: b168221821cfab98fddbdd04744e9a610f131bd008896da3fb344718dae9ea76
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_RANDOM_URL_LINK' further support the conclusion that this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smartech.lv/sites/smartech/uploads/documents/files/61715424091.pdf In PDF document text
    • https://teamcode.net/upload/files/82655724817.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/benekaf.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/zikozimufitidu.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/66722924541.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/37394528017.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/66244911603.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/47220377347.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/19462795336.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d447f120dca---renaru.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/10035388666.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdb2fef2d6---depidojonizimomopexapolev.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103a367193b6---84571303013.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6263fd4de13f7ad5905ab4becf7a5e03/xejumetufen.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/l378defhg778t7rfqikeutabpa/5833997971.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/jagujuvomiwovunoj.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607c859896161---sebovudumazivepolisezopu.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/lavinememi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58891852e3---74530433473.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fe2bb3cfb---44570392711.pdfIn PDF document text
    • http://suncreekpuppies.com/clients/8/88/88daaab1104cc9784d9cd8b59d189b35/File/61916615440.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6abfccb2b5---29719003194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=business+ideas+for+students+pdfPDF 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_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 10596 bytes
SHA-256: 0333e2d7ade146d242ba1a55daef1dfdec04037eb350b9e1af1c6e6a62dcd457
font_01_sfnt_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 16296 bytes
SHA-256: 0309f67d02b369275e0abcdcd5240a2a9ce5032ccd8289360ab2ba29f4aeb63b

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