Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f4c7fcbd4455c8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 13:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc2b132c60d95a5dd700845c8b4b4a72 SHA-1: 85e85764aa27ee4f94c97dde6f8d596539221c02 SHA-256: b8f4c7fcbd4455c80b0e0f04cde94d2c0d6d3a923a490f354db00c3f784a7d16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, indicating a likely phishing or malware distribution attempt. The embedded JavaScript stream suggests potential malicious scripting capabilities. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=fzmovies+2020+bollywood+movies+download PDF link annotation
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/61547311525.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/9792663345.pdfIn PDF document text
    • http://okvin.org/userfiles/file/14039318156.pdfIn PDF document text
    • https://eguiders.com/uploads/fixemalipi.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/66091431430.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613332e058c99---vixojaru.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/79971633092.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/zewarapi.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/81953154591.pdfIn PDF document text
    • http://apothepharma.com/upload/files/lonifujazuxubufijune.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/naxuxexoranerav.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/puseduzavem.pdfIn PDF document text
    • http://benjapakee.net/UserFiles/File/desuxodujalotolunuju.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/77330725199.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/36573264195.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/90505064618.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3c7b6ed6d---55504252914.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613821b3b0fec---27783414865.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/63335674862.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210916_041458_133.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec31616a26---gejimebeka.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/52208767290.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/36436096395.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210911081934.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_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 17412 bytes
SHA-256: d144f13f8b9331f8d748c7a55e7bb0aaeea88e8823f0e3197091c360101d023f
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D13 10896 bytes
SHA-256: a0750786846eb9474a1a69094c7b9f6bfd89d8a4359ea1562e7e812bf4c37253

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