Malicious PDF — malware analysis report

Static analysis result for SHA-256 603fd2744e592e22…

MALICIOUS

PDF

78.0 KB Created: 2021-09-11 17:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d6c0635033c69babafbc49ee9b81724 SHA-1: 6fb098f58919faedc88d3cabab6fd57d90b32fd5 SHA-256: 603fd2744e592e22626cad3b17a349d121c33f4da3f1b937094989472146871b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to WordPress upload directories or generic file paths, strongly suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://phubozena.pl/userfiles/file/wukarigigaje.pdf In PDF document text
    • http://xaydungphongphu.com/uploads/files/dixafadudafozanixaza.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210907152829.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/98665621191.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161366b8297046---83600487467.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613024fa16554---zitoxaxuxudiku.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/gupojeberore.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613988b2cae1f---45306658107.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/33539965680.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613654b5b3c3b---ranakamelaleduk.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/82158567230.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161384f9c92975---25208004149.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/85797659714.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/6043258700.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/70281525948.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/towiwowekilotokosebepaxo.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/071951404090.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2005662d71ab87003828804bc08a95a5/70494118536.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/bakujev.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/40477838010.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/19202147798.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/68761881748.pdfIn PDF document text
    • http://zimmerei-possert.at/48924891660.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b99d1dbd7b---gejiwejipupige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=login+page+in+android+with+databasePDF 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_off0000ca56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA56 10808 bytes
SHA-256: 34084ca95fecd8c89d7e6ae92b987b7daba49564ebdf816eb1cfdf2a3f074832
font_01_sfnt_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 18116 bytes
SHA-256: 99aa6aa85e9669f968b53b546e372e557bc014c217e1b03f7bf68f597a72650e
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1