Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0347b1781651366…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 16:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd4ccdcc841aad2f212eb97f2bef12ba SHA-1: 6060d98a3a5b0421e25c73a3c2f3545f07468820 SHA-256: d0347b178165136656ff74fe8ee6a66bf75cd6bcb80f7ca57b15fb4a28886a69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://interreg-ipa-husrb.com/downloads/202765823.pdf In PDF document text
    • https://aarhuskortet.dk/images/file/87993360054.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/mudefasugagire.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/95772476089.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/jaferazog.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed37da199e---belosukesopejuv.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f1927fb0a22---26690617584.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bae3d5438---73675173034.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/70308779986.pdfIn PDF document text
    • http://holzbau-napetschnig.at/mujexotenuxisivo.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/81551036178.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607102832d8e2---38807238933.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/fupipovar.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/59236243502.pdfIn PDF document text
    • https://irantruck.ir/data/file/75503793084.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/sukoravesuremewep.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/texorenodisut.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/97133822736.pdfIn PDF document text
    • http://elpijisystem.com/file/tozozogew.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/kakiwaju.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/68313649578.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160db8dc95ff41---pakolaxuvin.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/90213397781.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/38527421801.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/rodemowiparobukokakifeki.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/82108723984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=1992+toyota+tercel+manual+for+salePDF 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_off0000db1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 16852 bytes
SHA-256: 54334ed904d67f2da4270ba00c47c4846c0d9424fcab3c0847c3dd972bb531a0
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 10864 bytes
SHA-256: 1df520a47716daedd67d532910ecce7c49cef0aa9d24017b58cb593ad926d904
font_02_sfnt_off0001203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1