Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f52daefabdc571…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 03:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f99fb599010e103ece141c69793fc4bd SHA-1: dcadcea6785c6adc9c145bfbf588a8df54bd6691 SHA-256: d4f52daefabdc571d5dca7402a7d58dbf264e45cc0f6ddda6f5c740f3b5d4842
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to numerous external domains. The PDF structure and embedded URIs suggest it is designed to redirect users to potentially malicious websites, likely for phishing or to download further payloads. No scripts were extracted, but the presence of external links and the nature of the heuristics indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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=how+do+i+get+deleted+apps+back+on+my+phone PDF link annotation
    • http://i-physiology.ru/upload/2252465087.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c976e48ab3---xalifadabapukin.pdfIn PDF document text
    • https://ptogel1.com/contents/files/sanuraweposufi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad08c28d0a---duduranofufodi.pdfIn PDF document text
    • http://czyxchem.com/upload/files/pajonepife.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/xozaz.pdfIn PDF document text
    • http://keitbg.com/images/files/wesaxepujixonexapirozi.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210911001558155261229.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/votuwitejofojawefo.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/wagugisisiripapu.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/38935517347.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8f0621c6230b929356227ac1a9946efd/61677426309.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/dokakiparenema.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bef640d1d---nakajubeg.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/pamizaligedugononipiwosil.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/xiriroxebovofedezuko.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/6212877034.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/25282719718.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/mewesubusutepotabejirume.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/29320357401.pdfIn PDF document text
    • https://eurotig.ro/file/tagil.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/87469436991.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/34188506990.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/61015354616.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/52546329229.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/patuvuwejatovop.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_off0000b532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD49 11284 bytes
SHA-256: dab411dced3b36c7f6595c2badbe0d7111f45be9108b165779818ffb17ad1464
font_02_sfnt_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 14476 bytes
SHA-256: beb83a507cb3ab875fe0afc8a5638ee4dedf150efafa4a97d0fb4755619cb527

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