Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a4d884f6dac886…

MALICIOUS

PDF

77.3 KB Created: 2021-09-14 10:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 03b762efc180c9c1f1c3ab4bd123b356 SHA-1: 870a0c381383bef0e31bad54cd8e5983bcb02cdc SHA-256: 22a4d884f6dac88643f45d4bba8d2a717692cd2a1527e0b0251d99fa0d7ec66b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=padmaja+udaykumar+pharmacology+pdf PDF link annotation
    • https://pt2-turbo-j3t.com/contents/files/potefomilakeses.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/tibofizizavuda.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/23470996719.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab3e41146---dojagunezepul.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/98507898025.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/98532603679.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/xozozubobogutefojelogefo.pdfIn PDF document text
    • https://dintek.eu/uploads/file/42203558301.pdfIn PDF document text
    • https://mashura.co/userfiles/files/sixekirivavutolavilize.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/f602be8a2142c332e2b2af1e7f0f25cd/zodonewanurotinok.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/dozokesofunonenabuteremi.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/rimulevobotosixolofadapa.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/8959686873.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/juvedepowotifofutite.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/jododevaforudonikiloxaj.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/mh3uuf54d6qd7mrga7gbvi5t5o/58234104605.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/tuwikadoro.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/59723485868.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/R9E3bvXKApZ1.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/92935867609.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/26971489491.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/nubanuxowinafoka.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/tazotemojimawojaw.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613631d92869d---59877272457.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109011738488481.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_off0000ca5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5E 10912 bytes
SHA-256: ab71c77681dc9bc17a2311e8971fbe136d9f4498ec5abf0b6b1d6124684efe88
font_01_sfnt_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 16956 bytes
SHA-256: ea1dcf2271d94c5526753a4b6c6d166d3fe5e3e130c7c96e367c92a09a419ddb
font_02_sfnt_off00010eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1