Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6bd15fa30ba7a5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 20:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba529443e5050e1c5d0a42772bdbb4eb SHA-1: 6d6537f0fcdf302d1f66a2c58a624ba5a5e03ecc SHA-256: 7c6bd15fa30ba7a5d7b3a9ec00b8b2b1a1f70795de34ed564a0d8f4ae30c23f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting a phishing or malware distribution lure. While no scripts were directly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081e1a3ae953---45014316171.pdf In PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/fedovalilumisinibonoveg.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/45284551768.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/pozobilefonozavad.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/xiweloneboxiluzakoj.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608547eaa6094---gepugem.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vixejazitilurul.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/62651674801.pdfIn PDF document text
    • http://k1a.ru/images/files/file/zanelulejuzojamufufojukel.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/56424506334.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f6735dd4b0a7e2e6c9d1a39309877c59/1484050294.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/tosidu.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/kaximamasidabetebi.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/ponekiguwusi.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/zigiz.pdfIn PDF document text
    • https://zd-zeta.com/uploads//files/202108071546331121.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c852a94c67b---pobukirirubano.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39f709704---40275214133.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210516135256.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/59657531763.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/buvotutevukipad.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08ec16560---kumulasesumiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+rid+of+radical+in+denominatorPDF link annotation
    • 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://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_off0000d655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD655 18196 bytes
SHA-256: 9f7bd8892a42d6ba6ab8f5c15e92d89e737ac5e912060c71362f27fa5363900f
font_01_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E00 10728 bytes
SHA-256: 6aa1516114350ac8353a3f974e0111e30157c11d5ae661021619b4e19c85f3e7