Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e65229df4a65534…

MALICIOUS

PDF

88.2 KB Created: 2021-07-06 02:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8fedf916941f2ee25a09f25b6607800e SHA-1: 76f8f7077dd46f16278332b494eec020c1c525bb SHA-256: 7e65229df4a655341ba1619fed410b5b9fef31b8d85e7f3988f4e77209280708
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external sites, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://scbczy.cn/up_files/file/20210627_151021.pdf In PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/40660828203.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8a9312c26---80034324782.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d22400d484e---77504854936.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb50d6199c---pewutefemopuronaguwejer.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/lewazufolifen.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/suzarefumixug.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/853410a2948d463722647ff0be267b80/46843496493.pdfIn PDF document text
    • http://classtool.info/upload/files/povironuvufidez.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/87b6e88f3def4f365be1c450b77f4b32/28891237160.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/57315873066.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607335cf4e33d---8101951396.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/f63cdee53b74b1da44062475f20f02f3/bajitonewivituwomexepe.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/tulizagegopisuzusunen.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/302db97ee933af559b0d718c21acd4b9/7210634297.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/liduzakida.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/85675786851.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f606d69e4c5946a71e9910023dc31083/70158113926.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73cb5f71f---6739460573.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e98b347eed---97924501050.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/846b8184d967c53ce3d82819837f528a/rerozunavoruzovek.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gakawamovuvadexuvok.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/35791363826.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f389e26c5b---65121133651.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/79012001937.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/45808781145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=adrian+tchaikovsky+the+tiger+and+the+wolfPDF 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_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 11092 bytes
SHA-256: 401bd326e94c59f4d0c4082e600ba2bbba652b3397a11c2a92372644f296c041
font_02_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 16900 bytes
SHA-256: 632dcf55d5d4179d0520a5fe470bd083e5282f657b76b9993330824e9f2a6c64

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