Malicious PDF — malware analysis report

Static analysis result for SHA-256 22095351a9cbddb5…

MALICIOUS

PDF

88.3 KB Created: 2021-10-22 17:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f3ca00dacc6e2be0738b082da7846869 SHA-1: 174211546722192ecc7586257d11c8faa7c31c5f SHA-256: 22095351a9cbddb56c621a4da3c888c4c9734329472b229ccb9c6ca4a84c4127
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are hosted on disposable domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://synerhu.ru/uplcv?utm_term=standard+course+hsk+4+workbook+answers PDF link annotation
    • http://cdenito.net/userfiles/file/rizepuf.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616f70bd80860---91380108169.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/1961443522.pdfIn PDF document text
    • http://benrassam.com/uploads/files/80738540409.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/f93d110d93e2c688ed115d23730e5bed/53678664153.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/i5e56dahojbpi0l900dbpc0br8/vufudesitewu.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/rovibokajirebun.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210904_9C3ECBDA08F0A825.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/75769597261.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/laliporikumuvanika.pdfIn PDF document text
    • http://stylekd.ru/files/47159878198.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/jetexesiruniviwifetiwoze.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/pinotewozujedowi.pdfIn PDF document text
    • https://highrise.pl/file/xuredit.pdfIn PDF document text
    • https://beautydent.hu/editor_up/77657151248.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/lejomovuvotesugajoj.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/49460651719.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/busowudiwenisemopite.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/berutafivesorujuvapof.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109221057599592.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/tusozigenulotar.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ef23d007a07a9a1572ef532e08b8b4a2/6453656175.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/27138776260.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/bemijevedazuzeza.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/87487702906.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 1852 bytes
SHA-256: 4369864c63cd1149d35cc212820725c9bd5215c5a33b52afe3d32d94ccc97299
font_02_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 21228 bytes
SHA-256: 25cb15f7d886acfcaedbb4e07af8d86237e0f049b5d754d4609fe34cf7d53a0c
font_03_sfnt_off00013999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13999 10900 bytes
SHA-256: f73cd985d8395b17c41af98762fc823011d4ebf57d992e7cd1bc5fb09c8e5f90

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