Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d5d20567316365…

MALICIOUS

PDF

74.8 KB Created: 2021-08-06 18:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 93a5bd2ee612b2775f770906e7e872bb SHA-1: 4d49c54eacc94aa673c25a8c4344f73f50731681 SHA-256: 38d5d205673163658622eb26a4ca7d235ec9b8236919ef46fdb9e76e74828025
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9707

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://pistant.ru/uplcv?utm_term=common+core+sheets+drawing+equivalent+visual+fractions PDF link annotation
    • https://sieuthimaytinhcu.vn/upload/files/judisonimeludid.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/33396698287.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210618201428.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d9ea64b157c6f9caadfd6408e1c4a9f3/56122871880.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/telovazetokazulesorufelos.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a652e3dee9e---53138271352.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210531_115505.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3d78ac86---datetelola.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/14381582232.pdfIn PDF document text
    • https://lasanisports.com/files/guxotot.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/99706080281.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/doluvonomovavi.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/59660955764.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160da61373d212---sekevosop.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/18681632571.pdfIn PDF document text
    • https://aashianarealty.com/file/gagonuguxuzawekegojufob.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/998dea70f35872944c9f9a45960bb13b/gumulimiko.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fb2b9a124---jokipilinamifuvowevag.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/kawuja.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d02593117---biliteduzexedoba.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/kilata.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd290356d9---kixaxirulodiremofofanegib.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/15462321553.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1ab87e756e390dfb9f993aba51c79a5a/tudibulumesajasibabo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 11352 bytes
SHA-256: 283aebf594ad02829a15979299839c73008857f71893a6c59d1963b4ddf2599f
font_02_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 16220 bytes
SHA-256: 9dbe1a2efd429294c9100b9bfe333414bd6720ccf685c8afa4b1f4f506084eae

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