Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3dcb8ec6c5da40…

MALICIOUS

PDF

79.8 KB Created: 2021-08-23 11:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05897c642f0afc6180fd1129856b84b7 SHA-1: 08c7e0010e2c88c359009eb477605ae15c506bb2 SHA-256: 4d3dcb8ec6c5da4043fdbf19373c78ca7c4ed4be732e81ae90ce8548d9abf512
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 URLs 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 heavily obfuscated and unreadable, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://beachfirebrands.com/userfiles/file/99131214642.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b69f7b1c7ef---29925629892.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/13208280588.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a585458a61---43062040551.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/mufure.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/jalejubexasabivemodijo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078aaae573b0---25608966943.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/zefenobi.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad80e5b0e6---64009011284.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c093c22c4b3---xalorajudavazubosa.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/gsb4uqdkmr2saosvt7cpej6tu8/86806663160.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/65898626150.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/721m5452utc0cjfk99qjuiqihe/68447136909.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/alr6dhm092ggakmtrmtack2kp5/tolakusubirin.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35cc092406---lawepeporene.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607754e223d02---farif.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/6f61rg7gimhuo571lqcjugfau8/jagibewitewugivotagomoxe.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/50765167180.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/20391058490.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac160f4e25d---2426108308.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/xenetawegij.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/befa5a9c2a81bd477299f7fca6744150/perogaku.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/49552207290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cable+leg+pullPDF 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_off0000da56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 10016 bytes
SHA-256: e5ad195eb882eee1a4e4a45e93cc22b6a930a7ed97541a81db254061f1331d34
font_01_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 16248 bytes
SHA-256: 0c2f8e2a8c9f187ea5bb85a992d149144398eb5a49356bca3f433c06be08963a
font_02_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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