Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32b6fd9fbebea45…

MALICIOUS

PDF

83.7 KB Created: 2021-08-14 05:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6460df98f3e6aca21410ac84abc363ae SHA-1: 9b32c4bfb976b2cbb8cc9067c8495113ad92e5f2 SHA-256: a32b6fd9fbebea459cee9987e521744f7c66802c62693f8d1a1b11266bd4b909
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://smidgel.ru/uplcv?utm_term=libro+de+matematicas+segundo+grado+pdf+2020 PDF link annotation
    • http://gorisum.net/fckeditor/upload_file/file/rurugavovafixi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e3c28962f---jinajagijutebuwo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d488753fa40054c32cba6c9322000df4/wusejipakotesaba.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b60a835afa2e98d6d9e74f96ac5493ad/bilijisipudimikali.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ac3bc4b1---xegoz.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611584510203d---70111189565.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/7308243682.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f8674a572---56178038460.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad16adc30bd---28957926043.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/gudigadidapijedu.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/lesepepum.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/70307920078.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ua2q1rfrkqmd5ugiqm6tk2bun3/reresozapovudupikasov.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/paroxovalibunenosari.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/latuvo.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/42591886427.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/xopizitesiduxinilukev.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bbd9ef5f---95050985722.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/64230168065.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/44291852710.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/gdrp6i6lodsjk87p4pntfvo97a/bekivosudelaj.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/95466057982.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/figolowobogakufosoxagufig.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745f6e1403b---gulakelavuxes.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 11356 bytes
SHA-256: fb1a2e2d153cad590c176f53b8ac38d07bd9b84b017c44d9cf13c91d4649b43c
font_01_sfnt_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
font_02_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 17628 bytes
SHA-256: 2556bc4a4b8e3580de0b9a77255965a24867a3ff711ee1514caae205a7449723
font_03_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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