Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd52366c8b94c636…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 13:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82a0381f9e0f2f4abc46970bf1763ba2 SHA-1: 768dc87067330109d422f04858f9c49664ea9eca SHA-256: cd52366c8b94c636116a70e47a71f52ca8d36435010842d57f1e7a51dba2a00c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=samsung+grand+neo+i9060+custom+rom PDF link annotation
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/1633979107.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170934fd0d---lonumipelefarejerulinina.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/e0ngkmr3lgl67adtbl5re8ut02/78437116905.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/14706451842.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/33250630136.pdfIn PDF document text
    • https://forumsevens.com/images/file/mokijukitisofili.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/29696861231.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16144691bbb4c8---valufuwabafusutumer.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109071728237153.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/rinatonifawomabaweb.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/zupezixebojapinopup.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109081510137817.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/65348911993.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/15932953377.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/nefisuropabibikuvibaz.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/vimopowowitepa.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/xesuvinuxelivopisus.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/jimafesufudoji.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bj0fsg0dfp5uf0lujcp66cnbpv/50347709844.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/gavomufulamusazovowaw.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/71618593002.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/gitegiguxulepukitofas.pdfIn PDF document text
    • http://net-marketing.hu/images/files/kaxoxebibasobimatelok.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/dalanirakakomovem.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_off0000c94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94C 16748 bytes
SHA-256: 8f6519fba847282bd11ec20f1892cbbf3e2b2acabc7f70e3b4e6bf2c4a0d8d1f
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 11300 bytes
SHA-256: 29fcf4cc52115e35caad97f026b564f918e19f83a2a357aa85ec75624f70f8a1
font_02_sfnt_off00010ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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