Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e4c39be92d75fb…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 16:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 249c5b3afedd3a94e5dbda695cb54559 SHA-1: 7321e0773fa5b05c0f38bcf53e07e4a1b5e57d9d SHA-256: f3e4c39be92d75fb04f77bab48b682bf991e6fdc392c7a22607c1445df840d3e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to lure victims into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=soroban+math+pdf PDF link annotation
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c156ce2921---35193689910.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2d429c42---56219112270.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/sokenivefi.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/zakiwilabuzu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adf133c55d6---21088283562.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd429a12369---jilaxetajalufu.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162984204340818829341.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8775b41087---7889365353.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/g6reull09b36fm3uhu7f3bouha/147320786.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/mewiludozofasudowetomuta.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/59695152825.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/xuwepekure.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087139290670---japifavojopobamirova.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/mesenawokaserekotode.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b4ba3141f0---dumokoda.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/zeloxezugisofufefirit.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/50043995678.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210724091816.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bd96ea397---zigifalojedodamif.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/13280706369.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/sifefozogexoxe.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ac233b7544f624fd984f5c44588f6467/11239876283.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/78237129431.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7ba628e0d---pimiravefirodobixo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/wexabafumitiremo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859dc74f7e9---21442215525.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_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 17332 bytes
SHA-256: 1541ae8a570ce1f485d6891fe74b35fd3da1b29320e5d0457f60335e43f0ac96
font_01_sfnt_off0000fb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB54 10540 bytes
SHA-256: 2e12dc35ab10060b66fec56bb86049c2755069674b5667372f51668b5581270b
font_02_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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