Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c856a7df598931c…

MALICIOUS

PDF

108.0 KB Created: 2021-08-10 14:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8ff1a0b0802cf16dcfc61443d77b675 SHA-1: cc0a568ce2a55234a864f3062e222016164d9b35 SHA-256: 4c856a7df598931c622021ff45ed34d96e4aa81c84a97e47e0a3913479772fde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the PDF is likely a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://duepassidalcentro.it/userfiles/files/53462841860.pdf In PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/kaneru.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/sifapeva.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9cmi8a36ebhvemij0otjnouq2g/54452834301.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/fixisapakosemivokad.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/dee42688387c97a13718ce6cab4861a7/75123130856.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6c7b119d29690d52c026baecccfd8703/xawefadokemovelekar.pdfIn PDF document text
    • http://bdn10.cz/files/file/92145400330.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/10855888061.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/13703476120.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wurixaxudibajafubomimo.pdfIn PDF document text
    • http://surausa.com/uploads/files/zidesu.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/9531199120.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/70794185156.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/70c703f09d8c3ecb397be5eff996be41/puralugamajexigujudebuki.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/jusogu.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/pazanivanumikeberipinum.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ce203afd500bb6882b8f04476df8c55c/xojazoruwapu.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/xujoguzojuparixolivewibo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6f7c1bcc---mitajuderukikawutoluwepi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2ab49537bb80bb1ee68eac4e83b16fde/webiv.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/pekmv5n7s851t8coghsv1n3j1v/bojugizunizade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=exercise+for+conjunction+for+class+7PDF 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_off00012cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDF 10696 bytes
SHA-256: e3042e99c233fe97330fe0629004a87db0217edecfdb0c53156a1e6309c99b23
font_01_sfnt_off00014599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DAB 17520 bytes
SHA-256: 7d9a8a8133e195f046ea429f33ed4ccbae61a6236e0666e1a732cbb72bd06a76
font_03_sfnt_off00018b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B7B 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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