Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3ab53ee57aa1c8…

MALICIOUS

PDF

93.6 KB Created: 2021-09-10 23:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 139c431c6a7eed1849976f27b40f5e36 SHA-1: 545bfdd7ca6998570276225c19a2ed4fae22b5fa SHA-256: dc3ab53ee57aa1c81b5f09892258693fec83ea776434284e92ebff0fee60d347
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised or untrusted websites, some of which host PDF files. The presence of a 'download' button lure further supports the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alltechsro.cz/files/82362807615.pdf In PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/77753699077.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/nevovuloz.pdfIn PDF document text
    • https://kueapem.com/contents/files/senuvomeva.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/74147052304.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/tugewowetuvudobufugigewi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b5d7dc06d29fda02e62d11fb2bfa9610/wopolexudode.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a078963ae---56613927651.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/zejopimagawulugisudaz.pdfIn PDF document text
    • http://ahchala.com/img/file/48778513582.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6919593e---69874474757.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/mibimuduf.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/18980145231.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/34373755521.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/jerixavuwuma.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/boxezavapu.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/bazinamivefadus.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/gazagikiwebasalu.pdfIn PDF document text
    • http://tianfonmm.com/d/files/jifozi.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/felakisapiperix.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/sakukosilig.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/zawevibexetoredarokol.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/87066090198.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/savafaredas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cleo+sa+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 22084 bytes
SHA-256: 5505a50ebfb4929bc91844bcab01482dfabf25445728726a40dc6d756530a04a
font_01_sfnt_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 16580 bytes
SHA-256: 08dfdfdf2e567152096556dd2318c8dcde7fe75f14d1814c9b8e5420e704943b
font_02_sfnt_off00013912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15129 10304 bytes
SHA-256: e3ed4c70ad6a272dde0a4ea36edc1604590d4d0e1f0dda88a7d6617a159cb923

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