Malicious PDF — malware analysis report

Static analysis result for SHA-256 a257a572dc1ed01e…

MALICIOUS

PDF

102.6 KB Created: 2021-06-29 09:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d94604f867ed7801b7a416b90d8f8ffa SHA-1: 84f9fab8350af99e706d425fef0e03daeadc886d SHA-256: a257a572dc1ed01eb70b6d63475efcd4e60b13fa5125f83605b15eea81bfdf33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and random URL links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=hc+verma+questions
    • http://christmaslandint.com/userfiles/wefowubuvotabavimi.pdf
    • https://ev-owners.jp/userfiles//files/xosilefufasiwaz.pdf
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/33392342247.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096a22a0be43---nujefurup.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab7a2ef509---nujodewenaxima.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1a247ed2cfb8e36754e47ed1baa6aebd/rewutapifubi.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727f22ba5b3---sagugovowuzenasana.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/d5dstf84qj5tmm5de5oons78hv/lelukimina.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be10b1501e6---28176596736.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/tn1p88nbncv6780dr7lb7smg77/33300121425.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a181f1b5bd8---reredaxeduwitagatik.pdf
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/jilakig.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe903b5773---94866444071.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9395c1d33---diwazeboxugo.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f5a78cfe74f625c5fe2a274eff8eb6ca/98501549547.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6fe93fc155f8c002961266547978cd65/82903246012.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/28323412814.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/cu5vck8m64okrpmibkp3lh5pg7/94783613624.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da600da52ff---36065169085.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/jm52gqq2s02n6grjf8bc91bs6r/6934293824.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160967346d421a---430155036.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36baad26d---bukumukewibofapukarisog.pdf
    • https://acgroupenterprise.com/userfiles/file/jetanexeteki.pdf
    • http://cosmic-kino.ru/sadm_files/fujerojomo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111d9.bin
65db2e020aec4fae6adf40b9568b3ec33114669d23b4716c96805989c271e8d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 19860 bytes
font_01_sfnt_off000146f2.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146F2 16088 bytes
font_02_sfnt_off00015c27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C27 16792 bytes
font_03_sfnt_off0001743e.bin
b4875aee6ceeabe3331303ea16e2f3f8f89d9bd4a6ca90795c6212b19c220f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1743E 10648 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.