Malicious PDF — malware analysis report

Static analysis result for SHA-256 452cbf301a5d72ae…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 03:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d9d3f1ee0331becc0a47dc567b3c5532 SHA-1: e8add32d4d4bccaf61f803e465e4a823c8a4ea65 SHA-256: 452cbf301a5d72aec7fc77ac59dba9c0a65af129de58bed7e80882bf1ee6e0d5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b93c57d11---malukogisejakavofeg.pdf In PDF document text
    • http://dush-kz.ru/uploads/fck/file/tojizamezi.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/xuvelutusugewim.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///75940561671.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/fumowutaludumabejefezut.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d9f17d464---33514625103.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/609hclo8g6b1b8eobd72rg8i87/waxugelexozotuva.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/dedopuwazuvasek.pdfIn PDF document text
    • https://peterdegendt.be/file/54272999943.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/49ad0400711af6bcdd7f1015d71f9682/65364881688.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/14e108447123ad623a4d00dce32062ff/jenefemodoneziwupumapoga.pdfIn PDF document text
    • http://songhungthuan.com/upload/files/liveselixoretika.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/toragi.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/sipetudakubiroji.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/12429642114.pdfIn PDF document text
    • http://jfe.hk/userfiles/nefaxe.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec51b355e4---duxozuduwunig.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd7a8584e13fb75a6b6d87bb00a7e139/kuvonaseviwo.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7a4a8848652169f518e00759a59a5fe4/81935218194.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/ranadugiferomowonoti.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/4160280903.pdfIn PDF document text
    • https://fultoys.com/userfiles/38773203938.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/xonod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=analytical+chemistry+book+by+harris+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_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 11212 bytes
SHA-256: cce94cf49d92de3a7d1415987caa2ece4274a8f22faf98134660b6e1e09c4fe3
font_02_sfnt_off00010d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D23 17560 bytes
SHA-256: 350d108803c39ab1563828b81e76297e238a31bd011928a896934da48cd73ce2

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