Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c2255da5ffe433…

MALICIOUS

PDF

96.0 KB Created: 2021-09-02 01:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8d0bf3918d5d471fa53eb9cb05e2ee3 SHA-1: b1e365357ea6eee3b710ca5f8db13f3fe006ae42 SHA-256: 88c2255da5ffe433caf309d346eb6a06def4774353e40f91c8b22cc5fcbbb62a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many links pointing to compromised WordPress upload storage and disposable hosting. These links likely lead to phishing pages or malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://dilimkebab.com/userfiles/file/58460037627.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9843c3efc---4587807111.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/35430422334.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61428bfe6d---40409974886.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/tj7tvvf8n4fffcnh15q6ed7nch/30015770136.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/ximilalubemumizusij.pdfIn PDF document text
    • http://ponyomaru.com/files/files/46595135660.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/tidedutuvidilemakunepupo.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/6928594730.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c120031e5fa---bulewekemapefun.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f798a4bce8f---fapilowazel.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/69503385768.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/luwilix.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f500fd58---dagebeton.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/sodajeravixafiponurowup.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/23584592360.pdfIn PDF document text
    • https://maviet.vn/upload/files/84003008035.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/27288286069.pdfIn PDF document text
    • https://medtek.vn/storage/file/5542739096.pdfIn PDF document text
    • http://myqself.com/upload/files/bozidekinodug.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/6487090733.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/64117433501.pdfIn PDF document text
    • http://afslab.asia/upload/files/gaferinikalevuwitovovila.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/namanuz.pdfIn PDF document text
    • http://sbairs.com/datas/files/17702240134.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/pemukeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=chakravakam+title+songPDF 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_off00010fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D7 18624 bytes
SHA-256: 236b2f92077ebd9047745f6f5b0ac3c053f7e899d1d152d0316aac2f1d14b08c
font_02_sfnt_off0001587a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587A 10744 bytes
SHA-256: ff771979cc994090567025cd8a3be3af1338de62f738c81568d806af366915ba