Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9da411b6b067e4d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 11:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0998d14ec130c97b9b358e42c8ddf7bd SHA-1: 7c5f04c78d2b6bd7a95fc919dbf5f06727c3d555 SHA-256: f9da411b6b067e4dadbbf96a8473c78d713678926b383e6bf4209caf1b8d6a92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution attempt. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics strongly suggests an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=how+to+get+uc+in+pubg+mobile PDF link annotation
    • https://alternativecarrepair.com/userfiles/file/xezawuvedemut.pdfIn PDF document text
    • http://rld-carbon.ru/file/poderodivuzukilak.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/sudopivutozubexefu.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/f6k5kal28n8jqtlfuutcshtapg/53137670894.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/82283430548.pdfIn PDF document text
    • http://progetec.org/userfiles/files/38930217610.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/kcc5oi6u95li3tthqhs2qloa22/kukilinuwubasanixol.pdfIn PDF document text
    • http://standardamulet.com/files/files/zabozivanuwiri.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/63392256827.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/64362130424.pdfIn PDF document text
    • http://metapolar.hu/tmp/biwexejufow.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/xemozusuvixi.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/39309761272.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161306d7d9c757---36224301902.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/gazozibetupuxiwutasokap.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/632ec6ea0c9b7766ae8d9f7fb61fd586/judamukalapepux.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/65211642837.pdfIn PDF document text
    • https://baglab.pl/galeria/file/15665843216.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210912192024.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f41e63baba6e994a1b4d1dfbd82c1878/84777333778.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/34472243835.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/26832142091.pdfIn PDF document text
    • http://shesob.com/file/files/59966287934.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/7959612747.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_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 18416 bytes
SHA-256: 07c4502a8f070eec7dac574aab484b314a683f9a83ae4772f914d191db6f6fcf
font_01_sfnt_off00010ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA7 10604 bytes
SHA-256: 7330f8ab6d30a062a8b25923cc903dd924c8928a208d715716bdd1877e3a9d44
font_02_sfnt_off000126a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1