Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11bae710b7f8df3…

MALICIOUS

PDF

100.6 KB Created: 2021-09-11 09:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 337ca2f896122e84b15437bf18778373 SHA-1: 4cd7444ac6691d74e561fbf11e846cba6db5aa33 SHA-256: a11bae710b7f8df398287a6e376631bd969f94b5cb5d4a63530a8a8eefb80ffc
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mgrima.com/files/file/voxotibawulelibotaramazik.pdf In PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/63689396029.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/14488104561.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/95505321071.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378b2ddd3b9---dotilikov.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/28064451936.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/25457403339.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/norakitave.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///63777117858.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/30347871562.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/97388423634.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/33148665743.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/lawosokajik.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161353f235f178---57113414928.pdfIn PDF document text
    • http://videlec.be/ressource/file/51030259209.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ad06fa88fb0fc8e1d25bf4982dbf15bb/25801937168.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/laduxakirosivavize.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/kunatufejaniwuwume.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/44177694747.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/xageligamaraweminug.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/viveta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sniper+games+mod+apk+offlinePDF 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_off00011a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A55 10908 bytes
SHA-256: a3f9687837659fe8b9e3e2e1d0e88ac2cafbcf7085ca3b61153e3d9fdb475d42
font_01_sfnt_off00013350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B62 21808 bytes
SHA-256: c394b01ddd60270c3dcf150baa460fbc82684ba6db4f7762b9b7f9cb1a0894e9