Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1d549845598d35…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 20:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89d20c779f8e38f8a6ae42926c9d2cfd SHA-1: 98a9f0ec6b989c0bc3bd7b40ac7bfe90c2c4545a SHA-256: 9c1d549845598d3573327efcd11e3d2a14c5998e4cb7eaabb8cb26536835c782
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e48656c74ec---48537602018.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/texigojirudulununis.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f5564850---tusab.pdfIn PDF document text
    • http://93564497.com/userfiles/9099379890.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a176aa9745d58e8a4225bdba01280649/7728079216.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea54b3c87d---kikufulipipapela.pdfIn PDF document text
    • https://noddy.nu/images/file/maxipejumewegut.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210717/file/jesorutokavuge.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/vizojerafetasak.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/98460725822.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d293dd15e1---35610922854.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/rubuzijidoj.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/91476494249.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/tefowim.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/46381571311.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/31331688789.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/timogegimusakufomasadup.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/kojexumawizokudivosu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jhc2evmchm97epqforcgln19o5/14855276028.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/30661341033.pdfIn PDF document text
    • https://brs.jo/userfiles/files/41051334837.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/sijaxelej.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/b9sapedb8bvfm9c0ovji3k4mfe/vogibuwugetivakazigujebul.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089809491498---32741676621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=class+10+lifelines+of+national+economy+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_off0000d023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 16952 bytes
SHA-256: 2159fb8513b2cb266ec0bc1685b85004e395d2a76dc8a464e038bb54f2b989a2
font_02_sfnt_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 11000 bytes
SHA-256: 7fcdb85d3ea4c9387e63420fda09b1c07a0a0416d745025cc406eb4d7947d20f

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