Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20f443a5d366167…

MALICIOUS

PDF

77.8 KB Created: 2021-09-28 10:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 716120f400e3165350fe1005a8f72503 SHA-1: a7ae7d337a5f5f6d70521642249c36c894f95f1c SHA-256: b20f443a5d3661674140fe29c9faff65dc989f134c78e76b76499b94d857c084
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of link farms designed to manipulate search engine results or host malicious content. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://laborke.ru/uplcv?utm_term=download+aplikasi+parallax+android PDF link annotation
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44345138056.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/ledukeduxipudujilam.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/regofixobirulowunerig.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/fadozexiwegowunula.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/kevojevoseveto.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210905150600.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/541fe304c104dab892cbfdaef296dc04/vakog.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/28241891705.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/12080095388.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/55t4v9ejcraavuiljfluj7905s/36864823683.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/67230122355.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/xepativobigisab.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/25346059635.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/75033259707.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/getaraduj.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/vumutipuvusajeda.pdfIn PDF document text
    • http://nensi.si/upload/file/fefonutogemetiwoz.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/vuluxob.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/rovamotomoluwogel.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/rozejogaxavud.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5aa0df6d152260ec7e72e65682282161/65681732600.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_off0000c3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 19908 bytes
SHA-256: 8efab4b966b2c243e3c3161c0856af1736ed83753115b56c6db472eca75dfb1e
font_02_sfnt_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 10436 bytes
SHA-256: 5deb6cafd8930e533fd1fdfb9ce711a917cc35f7955349760e6a3e6b0cc6ff6f