Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a63f1b0ae10ed3…

MALICIOUS

PDF

71.4 KB Created: 2021-09-22 22:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1977f81ea60809720418f18002d4f669 SHA-1: 84dbe4f90d23ca70cecf2a5b4a886d99a73db89c SHA-256: b3a63f1b0ae10ed35fafeca76659aa9019bf9e5e80d7f455d987c1397d2250d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=xplayer+3d+pro+apk PDF link annotation
    • http://0975811252cool.linker.tw/files/86024880887.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/tibapitunudelawoxolirev.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141de9a89154---75786930906.pdfIn PDF document text
    • https://guijek.com/userfiles/file/56137222297.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161301a4b15ea0---nuzifofefajunixo.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/lagoguvogonat.pdfIn PDF document text
    • http://ceroki.com/image/files/42422938183.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/toxogutaninaripoba.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/02bafe665598d3c0e7045fd4b3762921/20721463946.pdfIn PDF document text
    • https://jobtiara.com/files/files/kinejexoragopimiwomel.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/wamikega.pdfIn PDF document text
    • http://come2menorca.com/images/file/mujitasigikod.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/74445798280.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/81423918791.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/69832241000.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/v3sijihc855flqqoavq69kl3u2/ralopijakoguwapinususot.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/buremofuxepokinemakireji.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1043148fc69953d549362ab28f7fc5e7/wawalalagijo.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/memerejajirizenipogo.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/52218188981.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/54981016059.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/wejiworag.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_off0000b88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A0 15784 bytes
SHA-256: 666ea20fda7563a2bc8829a328d5b8f359ebd7d70b490984ef3ca0e9ffcfaa62
font_02_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 10308 bytes
SHA-256: dc33e50cf9bfb1925fa14551f3f4a67cce7211971997d15b11d2e7df9f597737