Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53f8e7e42c8553c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 10:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05783752fb62166c1ff4b95e814800db SHA-1: 3c302d9c65613a6148f144604a52ff5ea6d902d6 SHA-256: e53f8e7e42c8553c8f11550493f7b6249f8cf84583b6a882e62fb5d5e9c5b4a7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, indicating a phishing or malware distribution campaign. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The embedded URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://smidgel.ru/uplcv?utm_term=asteroid+may+6+2022 PDF link annotation
    • http://stroisvias.ru/userfiles/file/76856568546.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16086e2c587c60---59231581957.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/bejajudu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ulhuncaij9urdul0i94g29es7t/37141982791.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4b65d167fcbed47d159e36ce685cd058/rifuxevatinijubezuxega.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e22febe74c4638019a3909c10b4df10d/zipukonidagoku.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0db0285c---14997412320.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/9046440549.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac84d7ab93---28519736574.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732d6bbf6d9---38114826344.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe1652de2---67909101537.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/xesewepuzesulefi.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/subebaralafopono.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/refumakodexu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b20a0ad74f7---82263297563.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/21/file/20210621_000641_180.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/jefirotele.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/rozirig.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/85787548252.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a395f2390---87802771830.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772b3253fd6---84827022385.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/98342303788.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/7624501061.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/8048729071.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/5ada0eee6ce4320d55841a0d3b223aab/fazesaxifotibezudunix.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_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 17400 bytes
SHA-256: f281051b5c52ab85e68401c7ee46763632583b9159b3a7763af857465173c16e
font_01_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 10764 bytes
SHA-256: f407d6416fa7514c21933326595d487400ff197bcdafdd65f8875bcbf74c15e6
font_02_sfnt_off00011c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1