Malicious PDF — malware analysis report

Static analysis result for SHA-256 400b484a40df463c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 18:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6acf7a03252f6f9a48fb4793f7d5d13b SHA-1: d387778e4c3a6c20a91ffe4184ee767cab8ca908 SHA-256: 400b484a40df463cf8ae87e9b70ed906146bbe4e6ccf431cfd0f7dfd8a1cfe30
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded URLs suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://praktijk.zorglink.nl/ckfinder/userfiles/files/47832475373.pdf In PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/kemesonobeniwekalawipo.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210904033311.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/64276626869.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/54826979899.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f704ec90ab---nefigutilagod.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/dobap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bc597b306---xaxuvopa.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/87984218985.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/54292428084.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/99499514400.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/87026272388.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/6077254386.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/pelamixemozalud.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc9440e8b---rebenubifuganujumoroti.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bd0fbcb730f88058a00fcf5dba6e903c/zapelufovozegiravad.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/lifibolifalim.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/563534848.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/39129942909.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/laliwiput.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/pemeven.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/vikebabaralibuda.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144407139122---xitegilafi.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/28679853250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bloxburg+minimalist+housePDF 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_off0000d5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B9 10952 bytes
SHA-256: 6824d2f210bb86b32663114922eb1d8f2869564fd2a489215666de414ccb3fe4
font_01_sfnt_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 17344 bytes
SHA-256: bf5dc753622f38bd5cebe2085bfb38290f0a29d3ccb3399a9dd545470e9d215a
font_02_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1