Malicious PDF — malware analysis report

Static analysis result for SHA-256 b966b00fae5d6ff0…

MALICIOUS

PDF

86.4 KB Created: 2021-09-22 11:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c1d00770d2a6d95b745ce5345587f66 SHA-1: f21b0d9184cb46d41be9c39d49d10a6000af3a19 SHA-256: b966b00fae5d6ff09a2d0b4d1b66681f6e83e7339482c7cb4178d175d45a6ff0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://nordiskvillaventilation.dk/userfiles/file/gekuv.pdf In PDF document text
    • http://newcityhk.com/userfiles/fuzovozakuravobepupet.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/27085780980.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/78876378402.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/zebojifeboxotaronasog.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/rejuwikidudigurujimi.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/34928259318.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614060e9cdd2d---21058597378.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144275505c8f---mutaxoxawulitux.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/17574445291.pdfIn PDF document text
    • https://fishboat.hr/files/dawijulakebez.pdfIn PDF document text
    • https://penal-garazh.ru/files/foduxuxitowexalutamu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613189815e4d3---79241060277.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/gutot.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/30540c638dd8a45684ae91cadcad94b1/4328995264.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/21675618354.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6bc8f8b7912dce303983251a2992d723/fekodunalifafapijibeti.pdfIn PDF document text
    • http://gazetavk.ru/img/file/83582527251.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/54450175540.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/xebujikobi.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/13482304485.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/58578141457.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210902_5746E67BB043C4A8.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/93149580873.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/4637666963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=one+piece+season+1+ep+1PDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/dikosajegexabowomemepif.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 10200 bytes
SHA-256: 60c73360d5dc5030bf4068f13954c6d1fca1b66b3ff95f4d54d5969398c28256
font_01_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 2224 bytes
SHA-256: 93f58e88efcad0461961dfa22a75412da2240f597eebe2787b2f24660b196a71
font_02_sfnt_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 20668 bytes
SHA-256: 435b6fd87ac23270c50abd100f7ac9612b5d0296670198f82450dcc2fc1bb441
font_03_sfnt_off000131b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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