Malicious PDF — malware analysis report

Static analysis result for SHA-256 a715dfec4debe37e…

MALICIOUS

PDF

116.5 KB Created: 2021-07-31 07:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d51356982bc05672833b0ba50154159f SHA-1: 30d2f2631c75600af829e36800247969ade5b399 SHA-256: a715dfec4debe37e65c15f3632e73af003eabc5d264ce62274c007ecb93ae1d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d6cbdfa35---tebapekopegotuteruzogutal.pdf In PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e177d9bb---bonaxago.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081053271956---wufiwuv.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-17/20210717083529826775.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0f688f21e---43387511843.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021615347302113.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/80971132150.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160757c93ecb1d---sijazara.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210622200633134.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/skuk23niajjje49665ekrrnkrq/vebuwuwogakibizi.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/51847809788.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/64674307418.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1896102e70---34024841693.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/f9ea3f7491266ef6acee76669b4c6012/taxapobapugabeziliwa.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/65e9a96b55535418b3d322fd7805f399/bazimipemopafuzul.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/kojizadovu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b48d22e44---47633719039.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e58da269f---1222088757.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/10806889221.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/puzuvizufez.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b915beb6a93---zatosobed.pdfIn PDF document text
    • http://jngf.cn/files/file/53605365713.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/75090888306.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/921b9cfbfd632b5f969cb16cfe99f239/51424658433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=naruto+manga+anime+timelinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 10360 bytes
SHA-256: ea3a51679b93b0ba726aeb89a2b8776a990dd90ab6c48fe40a2bdfae9210954d
font_01_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 18020 bytes
SHA-256: 771241af4d4dda1f2ecc4b888350d75bfa11289dbdb47124402537beb0d6f34f
font_02_sfnt_off00013cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001550d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550D 39380 bytes
SHA-256: 1eafa8ea057fe54a4d4cc1abca375b397bbd853af9c7dda1bedb2044b6a84a93

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