Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c1941d064af05e…

MALICIOUS

PDF

95.7 KB Created: 2021-09-15 14:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c828931247056132b4baf516e22ba22e SHA-1: 44001611e07b062a41e9282df98025f910e731f1 SHA-256: f7c1941d064af05e775b65f404e79963d1d35f20b3f239e67b94f21f6f185510
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS upload storage or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall structure point towards an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://dongduong.net/Images_upload/files/9192796453.pdf In PDF document text
    • https://vongtaytramhuong.vn/upload/files/60942326770.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/vugasa.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/71448857768.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a8598b37---kisemulizelozokuni.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/roralodutasi.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/vezeriwodozegovelokumuj.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/44910651842.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210912200615.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/zizopapaxew.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/36395607402.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/88618672605.pdfIn PDF document text
    • http://exima.kr/userData/board/file/rajugisizetexuvokojoxe.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/sodoxoxita.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jasunavanezox.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/lizifapakixafokoxaz.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/43663181475.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff7aa1666---numawo.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/weranerux.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/54874276857.pdfIn PDF document text
    • http://susutour.com/userfile/file/jupimilobuvoragewavunirod.pdfIn PDF document text
    • https://insp.biz/img/file/toramam.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/wovuxutoninojikaraf.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335690d8204---50906134169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=index+of+quantico+season+1PDF link annotation
    • 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_off00011152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12969 10672 bytes
SHA-256: 4104aef8670b2be7f5cc73341ea55583c136fbfdfe059b86c1d9373fac98a50d
font_02_sfnt_off000141e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E2 18136 bytes
SHA-256: b6b0639168fd2b8923f0081b74534b754b444b7ec3f5f1e9d9bb47a81b0d04a9

Open this report in the interactive analyzer, or submit your own file for analysis.