Malicious PDF — malware analysis report

Static analysis result for SHA-256 26dcac99f6863902…

MALICIOUS

PDF

126.0 KB Created: 2021-09-06 09:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 000fdb1bdcd185b46266ae704a6afc0b SHA-1: ca597712639f22fdf273c16d1a6ddc0f500409b4 SHA-256: 26dcac99f6863902c69370fec2836da48b3e3723a0c7fbd80b8ef0c132812841
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on various domains, many of which appear to be compromised or disposable, suggesting a phishing or malware distribution attempt. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=beps+action+13+final+report+pdf PDF link annotation
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a99191df99a606835e35231efbfff76c/zufilifaxodulisagibij.pdfIn PDF document text
    • http://kodemari.info/data/files/26760917697.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ewivekuzotizafas.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/71301302072.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/lukodasopula.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/nowufakuxedibulaz.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e7ul3a7pdqfl59amvla1b9rin4/zadugikugasamojopexifodu.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/xivakileraxij.pdfIn PDF document text
    • https://anfauglir.com/images/file/27994525948.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/kudamikonilare.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f23d2e017f---49031211012.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/97928081424.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160989e4adf4f0---32331086106.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbdbb6a4dc---jifumawozajumofokado.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095907be536a---53345859997.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/93387749122.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/wuvafanupokinolugegobe.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ccada7863---74779064514.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4c799f2df35b9988b64e0d36f4eaa5c5/pefivor.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/maxamusumovovafixiz.pdfIn PDF document text
    • https://chp-travel.ir/data/file/sivifajidibasuse.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ad8c8213543c398827b5e648d6a5d8f4/34804393186.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff414b8f2a0---tewum.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/jurunuvigitos.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1dcd6935---nidoxovokofejivijikibagu.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_off0001860d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1860D 10892 bytes
SHA-256: b364fdc707f40e0e9338098476da96ac447fb55e03ec047547d1570c90d1ed84
font_01_sfnt_off00019f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B78B 19428 bytes
SHA-256: d918c78a42eba49d7486b1cc87dab5ac943e4192588f0e141760e528a280f784

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