Malicious PDF — malware analysis report

Static analysis result for SHA-256 22db90d275c77a2a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-09 11:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 477fd58b7f39a5cc98d2225f083daced SHA-1: 89256a38038460095b463e283e88bd9c4a48ae51 SHA-256: 22db90d275c77a2a9d4f91e19387edd7a0f63694098875097b05c03d313a60f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered as a spearphishing attachment.

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://synerhu.ru/uplcv?utm_term=guide+utilisateur+android PDF link annotation
    • http://nieruchomosci-swidnica.pl/userfiles/file/xirezose.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/gexapavulufev.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/xowosumemif.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/52859942916.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210903143514.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132f95ee6f8b---58847167851.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/89611956668.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea450c5961---19611788710.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6b6b731fa3aa6206f4ac67dfa0094d18/rogivonamonusefegesi.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/rubazulukufujufe.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/vunabibemorofopa.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/38030789201.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e20dc8c9300c1058ddd9ad246adc8559/juduvanebuf.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/lifadaginukuxes.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/81036416512.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/mibagiwujaluguwujimupa.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/sepaneru.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130077626bd5---10767009741.pdfIn PDF document text
    • http://fullx.net/files/81820048845.pdfIn PDF document text
    • https://petikdaun.com/contents/files/32391614871.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/birogopaxezifu.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/lixaziwadowu.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/99198439939.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/12513244164.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_off0000bb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7A 16872 bytes
SHA-256: f68177b7a70884bd043f75d2c4f55de125b970da43300b7bcc40cc93fe5c5714
font_01_sfnt_off0000e5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 10380 bytes
SHA-256: 6d58ac0e16681ca4cf5ac548c69890f4e8cb9f20301864db25a695af7a118b48

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