Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4741e27f17b0243…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 15:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: faa1d21bfafe59bd0f22b02eae804341 SHA-1: 19b3a0da72b5fe0062377d0ddca5c145811bd442 SHA-256: f4741e27f17b0243daa05055cb76e7d4c52bd0378ad7da04ea1be22f82729d3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, 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 URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=cherub+divine+madness+pdf PDF link annotation
    • http://thamdinhgiadaiquang.com/img/files/5142426567.pdfIn PDF document text
    • http://spiregene.com/image/files/20210909_125653.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132646bbe45c---dadovuzewimorux.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/25064004966.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/47987572548.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a51474e2278531f7d151266e4ef75efb/66258710867.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/tufaxej.pdfIn PDF document text
    • http://signfabapp.com/ckfinder/userfiles/files/35499241126.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/maviriter.pdfIn PDF document text
    • http://haki.vn/uploads/files/23884556126.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05dc3515a---naxiwi.pdfIn PDF document text
    • https://viettrungson.com/media/Files/xarurafemozaxexexe.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/72715892385.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/varezunamivaribugarub.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090111343470.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/20017671226.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091911061973499.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/jonuferusuf.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/15770619511.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/dijidexuvixuwetutabolo.pdfIn PDF document text
    • http://castel.lu/userfiles/files/sepele.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/gajile.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/duwotolajanejizubil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2E 16508 bytes
SHA-256: 88162101549d9e2f2a992af89930e28f0d36c4953fcec4bb8a39b2f2efb054e2
font_01_sfnt_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 10836 bytes
SHA-256: 5ffa50ef08217ff459f717bec3f160804fff659c3d7ada8236fbf182a86deedb
font_02_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1