Malicious PDF — malware analysis report

Static analysis result for SHA-256 756df3408f2f7734…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 20:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6cb6ab4750b6cd06ff38f8d29f3fa8e3 SHA-1: a3f3c42412c5f2b6ff65f3aeb612f28e33c62578 SHA-256: 756df3408f2f7734c2a0c02d29ee4f751b496939b95b7c65b79e2dc69f003891
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, directing users to various websites. Several of these URLs point to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent.

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://queure.ru/uplcv?utm_term=simple+calendar+apk PDF link annotation
    • http://selfmadefilms.nl/userfiles/files/31931445816.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/7104680007.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210906023329697970glmf4.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/dexewevirefeg.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/76965679516.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/f8okcto80icgcluabjc3rg2i2f/3117317731.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8eb5020f3cd7367528b3611bb1f6ae6a/62102914573.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d569d47fe4---bagoledol.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/tofedeko.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/kuxezunidanevidate.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/2e6c6424dde69220f2048c11b7e4f315/16202156782.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/89976622128.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/pifomisugelanamawi.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/lopebovupomunukufelok.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a66ebc0dd---nugerepuvinewe.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/20567694994.pdfIn PDF document text
    • http://freestyler.cz/img/file/98481454949.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ec5aa2ecb8d87b46d159f2de6f04a9b0/neragane.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/97154857026.pdfIn PDF document text
    • http://masonhn.com/d/files/83281843538.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/51353108113.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/99108957709.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/80289823789.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19204973518.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/72127309948.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_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 18656 bytes
SHA-256: 1016cb96694e49de3c721cd05aab4cd00116070897e53fe6f554ffa2ffc745ff
font_02_sfnt_off0001221e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 10456 bytes
SHA-256: ea678df789f91ceaf60eb36ab337bb38011191a2b57f7c17b282898b9e91fa69

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