Malicious PDF — malware analysis report

Static analysis result for SHA-256 afceab230d2e717a…

MALICIOUS

PDF

95.1 KB Created: 2021-07-31 13:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0f0ecf5bdb67d5022d162c4945db10ef SHA-1: 8918a2959da35e14c55bafd2199eca516a6ab0f7 SHA-256: afceab230d2e717aef2ddee5554df3f82163a761b2a0a76af72dabb20e5bafa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608043213a1e0---5384249372.pdf In PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f2702402a998039e9c8b129d9a7f326d/xepilaxabajobesubebano.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/mutodonoxisivakul.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zabisirokifisugilona.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/31b994beeb7fa71c26a4e23368d833eb/68415735527.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071957fdeb96---sukafibemopef.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729405cd4bc---39177725346.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/rigesidozujolowol.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0b232c6b3916245878d2fbc18f41c83e/medibebetadogumapuxekej.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/tokujesifesabewabikis.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wapedakinapudana.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a72b353e6ca---lizebalasufugun.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/tubuwebejaronajezeze.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rdp9jj3sg6d8shijaedil9csjg/fegemeto.pdfIn PDF document text
    • https://unosms.us/userfiles/file/91587540706.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/xunujoxakovuriruvivixok.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db97adb8a3e---rezomilimekadoluraw.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/fafomivefep.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/18818244897.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/252a4f9c5fa1e3b0a50efdc8d1c6094a/87184673501.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/xufuvupemebegudupaxojoz.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/70142577766.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b841eded446---87413108900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+be+successful+on+hcg+dietPDF 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_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 17076 bytes
SHA-256: 6b16f0c7b4e82720f7b46c06cb14f450c6711a7d4c1a0107c9b67c29ebbe9e27
font_01_sfnt_off00013d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15521 10812 bytes
SHA-256: c2b2e0188c78983df6dc05799d6db1613893abdd075f921059c618f72364f1d6