Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f99b0779890bdf…

MALICIOUS

PDF

100.7 KB Created: 2021-06-13 19:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 809fdf443eed29fe715191b97a119470 SHA-1: 0bd4a320893c761ede613ed5ae412c0c6493bdcf SHA-256: 88f99b0779890bdf6c2219cd4ce7a46d634e99eb34e3418c90a73b573c2b0521
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest a phishing or malware distribution campaign, aiming to exploit user curiosity or trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://catamma.ru/uplcv?utm_term=chandramukhi+padam+tamil+full+movie PDF link annotation
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lkpuvbukm35mgfbkj6ech9a7m1/73276703644.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/webifunubixe.pdfIn PDF document text
    • https://peterdegendt.be/file/51197229028.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/bogizapug.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/e55f15751af6875abdb3b482b776f2ed/jesegebituvejeve.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/minuzilisuduji.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080b4b72ac99---zebolobodevom.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbe775220a---12834292355.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/bf2f5e3bf15c2d89f611b1381f1e1805/mosajo.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dd820f633---13080189497.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210608223000.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/546a2b30534d9c197770ad4e7d3dc026/45252583189.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/11f7969edc15d0db82401aed20d4beb1/paxexadolanuvaboketi.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/335075bfb7f795a21f0c9a8fe0cef886/jewumipememumifajog.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084a477e2f92---votamumofixabizigoledo.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/satabifafomefaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 5132 bytes
SHA-256: e533a5cd9364f773f4c05a24186f17c83551ee05f7e64dfe6d8e2f9f6c1ab149
font_01_sfnt_off0001293d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293D 3928 bytes
SHA-256: 50ffaf760d55dfc29cbb0715c21daa7207e47a090a9629a43d431d029a71faf6
font_02_sfnt_off000136d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 13232 bytes
SHA-256: f385c899cfbbe85f88a89d92731e0beae1f53d7b4c2f1889fd3005ca38a3bfee
font_03_sfnt_off000161b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B7 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
font_04_sfnt_off000176d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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