Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5c7dfbad7ca1d9…

MALICIOUS

PDF

79.0 KB Created: 2021-10-07 21:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 424f6dcb0720fea1802a29d5c4a29cf1 SHA-1: 710011960a89ee0340e98a218dc6660082797612 SHA-256: ca5c7dfbad7ca1d942185b74a3e8c3deeea5d521519480918567987cc5ce5af9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to redirect users to malicious sites. The embedded URLs, despite some being marked benign, contribute to the overall pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://utpcomp.ru/uploads/files/somozuriwaxamotixat.pdf In PDF document text
    • http://helloslow.com/data/userfiles/files/zezipevasubu.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/67118010883.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/47813225906.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1615442089895b---padumeginupin.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/tobaxinafi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131859884017---kurirelezekumosekuju.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/80147783145.pdfIn PDF document text
    • http://sakem.org/userfiles/files/31815388401.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/70822065926.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210918065105725.pdfIn PDF document text
    • http://zeci.nl/im/image/pubovi.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/lutabimixerumaxawuje.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/motosubuxeposavipitowogeg.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/19005919778.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210915151104.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/wigudewumumuki.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/95817953311.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/45563242258.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/cf9610adbab32f443fface548d4d9143/mapovixozotuxut.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/95971627731.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613924ab9e907---86544552225.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/3613699141.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/96790559607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=love+you+zindagi+song+mp3+download+freePDF 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://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_off0000ca07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 19192 bytes
SHA-256: f61476f57be6bb4af650f4124af2fbe0922c79a4c8a399ceeb7f0de11d91595c
font_02_sfnt_off000113b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B9 11300 bytes
SHA-256: 2ecea184c20fbdbe7bc3b3fb656c85d7bd46fda4a78f378cbf991609c79ebdf4