Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4335689f609174…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 18:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f271844bc21ba89ad6f8094f3f5c4492 SHA-1: 02af9c6eec011a52073e470c1732f0f63e16c9e5 SHA-256: 2a4335689f6091747a68817134d54fc23a0021a12baf12f32bb994382e5c39ff
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The PDF's structure and embedded links are consistent with tactics used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://huntic.ru/uplcv?utm_term=vineland+adaptive+behavior+scales+pdf PDF link annotation
    • https://llibreriaha.com/img/events/file/28361936569.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/76098472086.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/najaxomoziwub.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/lafamafibonudu.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/48068579922.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/634veh13lncj97311ebequei6l/48045697722.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee952b276---venetafu.pdfIn PDF document text
    • http://greenld.com/userfiles/65875574722.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/q6s8recs53dt1ojvam9ict5kmu/80693080913.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/44522932375.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/foluv.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/33ff1883ec2b45d9f9c503fb5840d2a0/tijojugezukato.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/zozimisefo.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/65612377583.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f3a4e2b2d---63591542121.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/n337rtb787f3jak233jh4hdvk2/gotedojifi.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16098305116685---wowagivex.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/14c52dd311d28dc0a6154794245202e2/futipi.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/ruroxakesatipevo.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/viporugeparakofuza.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/53716730188.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161165067717b3---20589297235.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/23614542114.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ruevf8bo8hip19nqtj6crmbjgf/85262960020.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/kinina.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19576265f0---99676993178.pdfIn PDF document text
    • https://parkettworld.com/upload/files/mokaritekosip.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_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 10892 bytes
SHA-256: ea7a2c25d33c1696d28759610d9c92dc29cf0feb3cce0305c07155a708146ffe
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 18664 bytes
SHA-256: 5d4909fc761f28ae42e65f70174fa69d9c138868d9a45294ad051d0fe5a17da9