Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ba865f1f6eaf82…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 05:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 65cf5636a56b422f96fdc678ac9491fa SHA-1: 4dbde11fdc2bf9df8d6baff99a717bc2a4ae750a SHA-256: 20ba865f1f6eaf828b4b254cb21a5b4cffbe39cb34062edf5a32df46a9b4d83c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely serving as a redirector to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of numerous links on disposable hosting and compromised CMS upload storage further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607811aa2cea6---48957350624.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd42e17527---pixedavonidosakarotaga.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/40632614834.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/51040770501.pdfIn PDF document text
    • https://brod-plovdiv.com/images/bikimarefupunumowokuk.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/35551923314.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/kqb17hh2rbidkqpf0ak68his0i/ginubanurapoporataw.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/25108591949.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/952a9457f979553a53ca9215a38e37b6/42165800350.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945beddad1c---faridonederitovag.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/201417595941.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/rozugabovefuxibemoxabilus.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/dogigirazij.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/64406401028.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-7/20210607043740185707.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/nuzulubi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ed81e94cd0f1eeb414a787e49298ad2b/44694812683.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/javefazibivupunuxiv.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2f4486284---rupisulutonibadaveniv.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/ruzutetobabifaxurar.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/74787017944.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ie42qrvmbrl3djrpe2ggika5qg/xexilovaxub.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/vibad.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/33258711734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=combine+multiple+pdf+files+into+one+using+adobe+readerPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d7e96bc3---23480871078.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 17344 bytes
SHA-256: a14a925f6ab2f32ead1f35743aea456adf047c6904b6960f14e29f20e9eb6dc0
font_02_sfnt_off000124b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 11112 bytes
SHA-256: 5dbaf74bc2d7b58473bf3a683d5961a7677c11b68c26e9b5a0d1b9704fc9bbe1