Malicious PDF — malware analysis report

Static analysis result for SHA-256 775c4d3b0ef02767…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 08:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 350dc16d3e19651ca5336216d11c6f2d SHA-1: 050c75abe8de571aeae58c25002a2aeb26ac7c5d SHA-256: 775c4d3b0ef02767acf08efdcdaaf8683fadc6492b804173b093fb38516aa07f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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 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://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/90e10162404dbf579d90ed9d6a167048/wubavijexovudavisemelepa.pdf In PDF document text
    • http://morecoredesign.com/images/imageUps/files/tupemuwimevepeja.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210713091100.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e04af511ac7---47988799327.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/muroxodumibupokut.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0128f89c3e50dd4a40e73f14f22b5b78/55850118126.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/rukebilolen.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/68418676873.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/89417823915.pdfIn PDF document text
    • http://lawngo.net/fckfiles/rufifakafixo.pdfIn PDF document text
    • https://ottopianos.nl/files/81217494699.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/numadu.pdfIn PDF document text
    • http://wamer.org/userfiles/file/89329438591.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4frdt1alee2mnhb4f04p2ei4gd/patusebijenu.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/wumojedagudalesilezekepo.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/46278481920.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/rerumujazanudobujupute.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ee8b190ec5e034f20fbafee23b76bed0/3152326950.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/47618700816.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/towixofuzape.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a9832c589---vobaz.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65d43126d0---lobumaziw.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/supivajifozabes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=captain+america+the+winter+soldier+torrentPDF 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_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 19944 bytes
SHA-256: 1f1c59db1aca5cfe8e6efcc62063abd8707481ae39b474daca01f59b4a1c0e26
font_01_sfnt_off00011202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11202 10896 bytes
SHA-256: 5274d3a0e9c578d2185ec1b22441af40e6424303fe8133de97d3eefc9ffaa3f0
font_02_sfnt_off00012b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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