Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb193ec5ae152b0f…

MALICIOUS

PDF

92.0 KB Created: 2021-09-01 14:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b0076c16531402847946c1be7631dc30 SHA-1: 5684cf48af5fd00f864a9b7ec5ba9af018002700 SHA-256: cb193ec5ae152b0fef738933bffbf6710a2ddee3e5014fa9918ed8e88db718e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of a link farm on potentially compromised infrastructure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d0f64812a---devapisetudaxutiba.pdf In PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd397a4c0b3---95541819257.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/77418199065.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092a241b7a49---jikimesikubisovomewojaket.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/38978438273.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/93019721994.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/1d93cde061f373f04ee08662f3fb7bd8/konosagijaxoverak.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/82166831605.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/60661729942.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/48425839935.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kirulixafozazoxodet.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/882b7b91669b468e3de006dbcc43ba78/gupadomexesowokitamogo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756aad37e5a---majipibimonasonibu.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/70069367043.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/58775512499.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/valovukigopagekud.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/69206741097.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c488293d20c---mosileverefaxuzipufiz.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160927233a0773---vujunolibiretixatanexul.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/d4a563cabcf05792ad3a3680f3bc7710/84067083158.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/6ace842db1f653eb22094d411fb25499/61772335525.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/08/09/file/20210809_142808_140.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/93886305943.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1611dea8091d26---foban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=watch+the+thinning+full+moviePDF 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_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 10672 bytes
SHA-256: 356e916f1264671ba724141d9dda6d369b41dcd1b9cc581feca79bca6055a787
font_02_sfnt_off0001341b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341B 17596 bytes
SHA-256: 00b4ef71ee11dbdca2e8337d1e573261634644800af5e826d9f84769606d5f40