Malicious PDF — malware analysis report

Static analysis result for SHA-256 636553cd76c43e59…

MALICIOUS

PDF

73.5 KB Created: 2021-08-28 09:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf947a29358723e373592ab4e6e3e9cf SHA-1: 92b2f2c3f692906fe66fb33f112a3b84f86bef22 SHA-256: 636553cd76c43e595e054cabe0a9ee0d64d12e5324840e76c1c0e62600f3d480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of external URIs and link farms indicates a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://garglob.ru/uplcv?utm_term=most+expensive+pet+cat PDF link annotation
    • https://airbays.com/userfiles/file/32780062425.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160af72a115d41---pizesev.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hthap56q6lm08l9nrqkdl5aj66/bevakuxizuwubefexadifaw.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/tosunakiwagije.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/45661484583.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a3a628f99103dc00a10bee5ca93c31f7/jedob.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/sorajatu.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/jepogubewegigakojofufi.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f71afb16ff10f786b19448dd18ccd2b2/13027178536.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/88087183250.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de4960780f1---50230080283.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/79787391456.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881fab91007---vekinejusoj.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/18093878070.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/zovofokidiwaraguwu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611a6e56bded8---sipipuwopu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f3853a85b2a---45311086513.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/22573a53a7ba767cda2abeb55c98ffa5/28806882005.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06e099f1ca---xijunapojitewuwatebutip.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210821125425_bt0apf.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/55856830607.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d757b16970885b85fda0414a8937891f/doxajoxodisosajo.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/88844378023.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf647f889---15993618714.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_off0000c1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C8 15128 bytes
SHA-256: eed5f8e879cb663e804f24c17fb2dfec83e74bcd6acb5e5fea2e9e543fbff13f
font_01_sfnt_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 10384 bytes
SHA-256: 6e5a3de74e3aa59857b10cb3e71552896783a99feb20a0bfde0b6f1a92dc27c5
font_02_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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