Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59de4c3c2a7929a…

MALICIOUS

PDF

84.9 KB Created: 2021-06-27 17:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d1100ad3a3fbddfa766510fc6083e30 SHA-1: 43ba591a76fe983df1b33690ca87cdd6553a87a4 SHA-256: f59de4c3c2a7929a77fbcaf658e30883717ee39b383571dc84edee0be59fe141
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or redirection scheme. ClamAV and ML classifiers strongly suggest malicious intent, likely to exploit users by directing them to malicious content or further stages of an attack. No scripts were extracted, but the structure and URL findings are sufficient to classify this as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://akademia-jedenastka.pl/zdjecia/fck/file/16683951677.pdf
    • http://aylincinarli.com/fckfiles/file/retipivemananedoxol.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/loroteganojeruwojamu.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4366b1fe41e55345ac64b62a85afb8f1/sotilogojijupovuruziso.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7e0a7e3ebf6ce8c0b37c5e3fd0d4bb70/jijonepuwefurolesop.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/68562682780.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c770ba67b7d---12264645972.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/99597058261.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210503041826.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3fc0de7be---kopedulikabaxolitonoj.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4aee57b5e---vixawemeguvizav.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d42b93c2212---56226222007.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607be0888a3e0---41408220275.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d85d5fa6---6927056153.pdf
    • http://www.dismaplant.com/ckfinder/userfiles/files/67231471192.pdf
    • http://sklepjola.pl/userfiles/file/76797662362.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed747dc3e1---73351749294.pdf
    • https://protectname.xyz/whoisprivacy/userfiles/files/giwafetajebuvinu.pdf
    • https://foodvellythailand.com/upload/files/fewisenota.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc4b99680d---91388051693.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0d2f75d78a9889952c0a497e55a4b4c8/94468990391.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/sefupezapexulinewi.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607f873fe489e---kirozufujatikumivu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+plural+of+hero
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b5.bin
d3a780b7851061425351f441456e6773baae3443078fb59e757799994b756b75
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 17336 bytes
font_01_sfnt_off00011668.bin
fcc941ea79241fc505079a2be96e2149cb32be6867bb9eb58445a7b24de845cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11668 10056 bytes
font_02_sfnt_off00012ce7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE7 16792 bytes