Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19db0c1323f38c8…

MALICIOUS

PDF

68.3 KB Created: 2021-10-04 02:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd4718bcc1cdd77c3a94c2162b76df04 SHA-1: c7522c7d80b51317d9eff95aaa83e987ae6b7745 SHA-256: d19db0c1323f38c8fef2906d20c7afff9df5a9324065d48eeedf8181ec9cf888
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm or redirection mechanism. The presence of XFA forms and malformed streams indicates exploitation attempts within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://alariel.be/userfiles/file/51885287856.pdf In PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/varusorasipirevup.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/nedovufuzegowuwabe.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/44268127867.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613339c8268a7---muwafigatitotatir.pdfIn PDF document text
    • http://all-premium.com/user_file/files/65384203020.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/71916735065.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/21550846119.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/51885051747.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/risutadef.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/vesube.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382aa39a45c---rilozejasebitemasagiliju.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/37438776465.pdfIn PDF document text
    • https://12tiga.com/contents/files/zegekej.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1614279f45f00e---folurepijovawixemivuzexut.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/feriveluxa.pdfIn PDF document text
    • https://finliz.lt/i/File/gojovososorukofa.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/77343766325.pdfIn PDF document text
    • http://waypl.pl/upload/File/vamezerinipol.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/40952197701.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/tofuxopogajawuzoxa.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/80001685940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=english+story+for+intermediate+level+pdfPDF 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_off0000ad5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC573 11108 bytes
SHA-256: 523f4fac68a3cab65673da5e4ba94eb5e5993543bef172724d3755f3d1de8300
font_02_sfnt_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 14620 bytes
SHA-256: f4886919d9f02a23e118abb0b1a362a6f68d039fdb3421987a2357a879abf3b3

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