Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b8fd5ce91acdd4…

MALICIOUS

PDF

77.4 KB Created: 2021-09-16 13:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb57a99ca63b96efab5cc38521aa209b SHA-1: 084cd2e468df169126df9ac84d500380ddaafd67 SHA-256: b4b8fd5ce91acdd477aace737b989a3ddfa037927de2c62e95588bc09c912fc3
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable domains, which are characteristic of link farms used to distribute malware or conduct phishing attacks. The presence of a 'download button' heuristic further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/59935043231.pdf In PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/70966885428.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/divemoxapegujiritisode.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa0ee25b6---65137265138.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/tuzomedanurog.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/26487764214.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/worevozili.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/lawaxutizolazudewe.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/c037b92e32ed317969946cb8e6d38310/kagodilukazematotirajeb.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/56347745707.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/95500315501.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/74107253504.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/kebekop.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/rafoberorir.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630981260.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bad8cfe91---30443847878.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/fobawogozirulexanafa.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/bemesatuluripoge.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/53717384752.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/gotivinidisejamizi.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/75825559904.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/3802889239.pdfIn PDF document text
    • http://biosite.ru/images/news/file/45230878778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+reboot+android+tvPDF 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_off0000cb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 10312 bytes
SHA-256: c861fa6b9449f09f0d5b3f0cf58ba57b447c8e8a72873a6faebca678bc5931c4
font_01_sfnt_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 17616 bytes
SHA-256: ebfe799b77e5f3e031fa608efa56cacad200e4790fb733bd759fec722ed52fd4
font_02_sfnt_off00011047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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