Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15c0635c00616f3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 20:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 346447ad627bcceffaa4b61c68295fe5 SHA-1: f45042b2a5415ef8346479c65946fd9595aa7c30 SHA-256: b15c0635c00616f3ba00528ed0fa6956f85078f9288b4ab731e324d8d1a5da22
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The embedded URLs suggest an attempt to manipulate search engine results or lead users to phishing or malware distribution sites.

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 http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16073a285a62d6---82701962410.pdf In PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35c786cff---69287942256.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/pukalita.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106230600333094.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3f2u4sj3jegmaod22mn8a69jg1/61405998339.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jcemqi4r8hhta98bmvpd8a0l59/tivuzoxejiwarejukex.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/xubanej.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/96121932866.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160771241b6923---36198270742.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/25749728563.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/faletiwipolonemirav.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/41236803308.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/64396423862.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/sisibesepige.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/95262292741.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/68954216013.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/benixajuwojivajefof.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160967c94c4b46---gufizutufalemugo.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/aa07b6d727916b9fe9997c6f0049523e/rapudusaxujidaxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0aaca3de0---82664277096.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051353753_559077538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cloherty+manual+of+neonatal+care+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_off0000cfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 18412 bytes
SHA-256: f3e3ff7af484482511467c4b581ca0198bb47485a66bee23cf1baacde312bbee
font_02_sfnt_off00011724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11724 10872 bytes
SHA-256: b19317014bba287256a53e4b18648292c9284b71913da2fa999aa3527293f686

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