Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15db36a192dc37c…

MALICIOUS

PDF

92.6 KB Created: 2021-08-08 13:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9126843cc91dea317c78859bae3f21df SHA-1: c1533c0be995f52616494af565b6dde0ec72f6f6 SHA-256: c15db36a192dc37ca40d6ae13b73370349c6c830f4b175eebfb26bc73f3197f5
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, with several links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable due to truncation and encoding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://asesorgubernamental.com/images/file/80191890794.pdf In PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7dbeb2fd0---mexepavivenazanuna.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/dolifog.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081784d9cc47---tajavibodizavodasowig.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2ed68368ba0ec1db77167cf6a906802c/suziralanotepibafurekij.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/68d72f89046a1f1c062355c4478cc525/80973521020.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/71047747809.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/vejexozirigazufijuw.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/27732337343.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/pr3urpotk0529an1k1j52niref/tifevuwozogivebes.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/56032512038.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609676aa3176c---50783479442.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802c9b569e3---zosuzegapaloj.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/44469595295.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/e7ihlg8ca91itsr6rbgjk9ecc2/68889815353.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608375040d423---23653053050.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/bawogama.pdfIn PDF document text
    • http://hongdacable.com/d/files/bunuj.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021871727105795.pdfIn PDF document text
    • https://fallsplat.se/file/30002088879.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/ec5e0f0fb6d4e65e5d458a16edd31f2e/jezeduzoxumelaroxope.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210709070614923.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088fe8bf1f2d---xawuwojisawizube.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/pezivuzigalaresop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+pair+my+skullcandy+indyPDF 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_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 10828 bytes
SHA-256: 2193d4346e2243b5297e111f99b6c3dfefe1a09601ba18334c4a359b9a9d61e9
font_01_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C0 18432 bytes
SHA-256: dbad62570e9daf5319eed78fc09193089551cb99eaa349be3cced62023671bcd