Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1320a90ac0e3a71…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 03:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0af5ef46aab58f3118ab316ef3aa9f72 SHA-1: 169ff125c9ddaaefe61d6587989cbe166786f8ce SHA-256: f1320a90ac0e3a715747ce147829b3004d34f34177c3878aec1558b683364d9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL findings are sufficient to classify this as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=show+blocked+calls+android PDF link annotation
    • http://co-mit.com/uploads/files/likeximebipatalowotak.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/88798508421.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/46918520639.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/69591462071.pdfIn PDF document text
    • https://maviet.vn/upload/files/70045375248.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba5648a22---15055922539.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/kinovutemuvevixanovusodi.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/rafab.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/lefojoba.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/dogafemoxuler.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/42622281128.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/sigelifagasibom.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/22790068122.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210914002824.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/samopujobugazojapetizawot.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336efe3c5d9---podapovukuru.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/xunoxosekumawifek.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/kegolujis.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133653c72828---39269662016.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/69379168097.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/37577425878.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/kokibokurituzejeko.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614333c856809---42593441726.pdfIn 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://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_off0000c294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC294 10760 bytes
SHA-256: d063729a8d46fd85e7c9e9cc50cd643937295ccf02c24ebcd456a1e1a9274ea1
font_01_sfnt_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 16564 bytes
SHA-256: 8482b8097d873973a6af9c820ba0dec3233e8f3366126e9c5c655a305b4058e4

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