Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea52e4f080b0f45…

MALICIOUS

PDF

91.9 KB Created: 2021-06-26 02:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68c9645cf19f2177756dd8b3ae045393 SHA-1: 81a0037711c217d6db91d89fcda926d2d82ab71e SHA-256: 4ea52e4f080b0f45f47e21fffab16d83a28e04c9dc3fc30b2de1e97792596b25
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be social engineering via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://planet-for-events.de/userfiles/file/75633269013.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e954aa92c---gopepefexibawobiziru.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796e40169f7---21605854945.pdf
    • http://bigsvatcharasith.com/userfiles/file/29319231817.pdf
    • http://accu-chek-event.com/ckupload/files/sabokepisapokavimibopow.pdf
    • http://urgentcarepb.net/userfiles/file/92993949803.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607583f9461b5---81636448890.pdf
    • http://dorrstrechy.cz/UserFiles/File/35653371002.pdf
    • https://anmoul.com/userfiles/file/31616725106.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/12d78eff6024d5fccd115d94cc5b8363/livagipijugen.pdf
    • http://www.hgbehringer.de/img/files/files/zasoxefotuw.pdf
    • https://girilawfirm.com/content_files/files/tujujajojoxizetefenosude.pdf
    • http://danielbushreunion.com/clients/41596/File/82001683300.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb996c7a06c---64666846272.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16087943cc428a---58149297250.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607594d6dc203---99300687014.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2429524ffa57b28cef0ebd6baa1b12fe/58369495578.pdf
    • https://lecapsuledigian.it/file/tamobafesuxamivavajezofi.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da7b6927c9---15504755589.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/36729726f7fcbce6915f387a9324dfbd/zefokeruz.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe8527cc1a---damori.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/9f778cca3bd291390f37121514d92be2/10820911353.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607353fa057c5---nerira.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/568759dbb0ab2068467708a7e4090742/99366370771.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=anabelle+1+2+3
    • 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_off000104a1.bin
ebc16f8d7492de7d04573dea511b8e41b9cef1ee28775ba510ae191a0ecd8509
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 9988 bytes
font_01_sfnt_off00011b00.bin
006edd24549e963e78041b70bb01659e3a56da564ade3ab73c410bad3dcd59e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B00 17928 bytes
font_02_sfnt_off00014a5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5D 16792 bytes