Malicious PDF — malware analysis report

Static analysis result for SHA-256 d453d26a91c1e6a2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 11:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79e6bd86f97b102aa9e249b39423c6a7 SHA-1: 91392bf7ce076f7acefbda2b9d56d3d4dc1eb908 SHA-256: d453d26a91c1e6a278d6e2df324d7f264e8f227f56d37abc76cb8baf0937b3fa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hotelharmika.com/assets/userfiles/files/gasazapolexogi.pdf In PDF document text
    • http://jinruily.com/UploadFile/file/20210910175906173.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/59150589863.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/66848048066.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/rakijuvefigazijapom.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613749e16b7da---85601112127.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/2564496907.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e46ba6d4e20990a2d3a6df6d1a2c803d/54868929171.pdfIn PDF document text
    • http://parateam.cz/file/tifagupadoka.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/47914020772.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/rubaxobixevulujebokogov.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/58781689242.pdfIn PDF document text
    • https://clickbox.ro/images/file/82950994298.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/5535473042.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/tanofagudogubezanaw.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/vilotexaxuvalapidom.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/kejus.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/80897434241.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/74481408618.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614050cc0dbb0---56580471932.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/25107491078.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/lelaxosewifuriku.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/xugomojumawojeluzo.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/lajazesazekeli.pdfIn PDF document text
    • http://momsystem.ru/public/file/gisobimikika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cast+from+phone+to+laptop+chromePDF 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_off0000d787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 18916 bytes
SHA-256: 628dfa2d8a6bd62a05804f94d11cab82812040d1212a389c0595880f19225c48
font_01_sfnt_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001215c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215C 10684 bytes
SHA-256: bf53063f9fef31488e26040e04923865c8ae256442a773590f77921ca212cb82