Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e41b1a72ba15937…

MALICIOUS

PDF

98.6 KB Created: 2021-06-30 08:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e3ba441884a31dd789fcc82a83215b87 SHA-1: b3cde6bdf1d378eedc46bc92271a72ddfd69ddde SHA-256: 4e41b1a72ba15937d07b46dc584bc68bc8b615f216b0131f57d627b339e1add9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these URLs and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wastran.ru/uplcv?utm_term=one+areola+bigger+than+the+other PDF link annotation
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/51b83e53e8d821b62425236abcf97902/tubaranarugemozefavokutuj.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/koginikutaxufivarino.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ada2aa9f88f---xokofubonekabogaza.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/l85iaphqcv8sc3g380kp51ifao/vuxagadenasowi.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/64dd728df66be018c0ee4c458ba1c5a4/17186972596.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076e541e0ab9---46173999955.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b08e62540d0---nudedaranabesovu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a34dcd5cea4---zelut.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/debegosalipebive.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa5c7f3f55---pusutiniv.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/voxanugatuzarusoku.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfba8aa58a---59450480239.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4b2546b8b---20107484531.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160740075c8cb8---wasifetuzotewexix.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78e0c08cb9---mituk.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/55b2a21cc3c174d0e122fcee60111f09/5984452284.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16213972801606.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/natavenadixibiroderojifa.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8e5e0b49f---36287188471.pdfIn PDF document text
    • https://tonitomov.com/picture/file/liwivejotolagigurip.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/41571519353.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_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 16772 bytes
SHA-256: 168626aad441f65db56790a493d17d57d42eb780f6db6dc170dfb0675695de3d
font_01_sfnt_off00014dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000165c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165C2 10384 bytes
SHA-256: c4b24a4bd14162f4601e62858d357abc581266abc5a97cf4efea1bdb58dbcf5a

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