Malicious PDF — malware analysis report

Static analysis result for SHA-256 100c77623c74f635…

MALICIOUS

PDF

71.2 KB Created: 2021-09-04 05:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f16ae9f161cbda2a3416cbd4804b6924 SHA-1: 95a0d34769c4664888eeb829ee00edecc92920a3 SHA-256: 100c77623c74f6351abd6d14fba7b9964796d0573ad817219f59c31b0d05aa37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm utilizing compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the overall structure and detection indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16104bd3999cb9---20431903639.pdf In PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad67e3672281f213156b3ab8209bd173/19179444274.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/77443213032.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/xapuxotaxufejanedigowi.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16083a165e740f---60135206730.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0a963e8e2---dazolusesazezejepowovefen.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/tinavekage.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/d56facb249b4a0934b60fcb52a9e961f/13874274008.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/8h0mj57h237ameo0oqtqabfeev/58997045366.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/6531225559.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c521bbcaf9d---letitufetunozitebu.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/43183394021.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/62950101571.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/waxezuz.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/62a5347e26b5eedde8c4146cc012792e/73833088581.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/kodokisurasafibemovinuk.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/butoxadoja.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/wonunutijepu.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5fe053400428137cfeb1695e3106ef14/dapaxijogowej.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae2c7061ac---67702458809.pdfIn PDF document text
    • http://htcable.cn/d/files/tukasokanibizunuwovuripaw.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5a110aba9---fakuwutadimimogujur.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/egde3sh1du9734tpdqhvarhe65/tozigoxumij.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fff2ea635---48136821637.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/47cb7aa8fb67edda91d24d2284a0286f/mazaveduwaxe.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/74370321634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mixed+parts+of+speech+worksheets+grade+5PDF 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_off0000b7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C1 11156 bytes
SHA-256: 81a23cd133e2df6c6742e5a025f274683dd358fab4e0bbefa1adaed05702d69b
font_01_sfnt_off0000d1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F1 15152 bytes
SHA-256: ff894f91990aa34f3c93aa8d3e283196555b4f68bb825e9b69811a73e1a68ca6
font_02_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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