Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fa2aad712e35bd…

MALICIOUS

PDF

97.7 KB Created: 2021-08-20 14:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 60bc11d7cb4dc627b5c8cf8b1fda9491 SHA-1: e606accb48c749559a53200b44b4b5e4e2b8b1d8 SHA-256: e5fa2aad712e35bd2381941339e66989b8c85f916bc81df4ff7b3e6f166eac3e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. The PDF's structure and the presence of external URIs strongly suggest it is used in a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62a3a2455---21787086407.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/700ed0851821aadabcc3e6f6c06f2cc9/fomupapikoxezabuv.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/kemosogetuweneguf.pdfIn PDF document text
    • http://m2m2design.com/userfiles/206544324.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8151e630d---78165964330.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/worezunidiparobesipoxorij.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/37038644237.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/880b86cc3464a97ba1f28a5e33a77846/femofefujubazud.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f06345227261d5435afad3e5ff776a16/52808852738.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2728d6da5---3029636166.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aedbcae27b8---vewopo.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/sinalumitufarog.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/meruvitifujubav.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/604e55abfeda70636af1a8d942109830/8163045543.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65e3631386---xubawexeku.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/68616192836.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1b6560cbabf2f95cb3b671659d54de8d/95449767350.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d37b354e3f0---nikawupujopomozapam.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/lawutanum.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/xotowoditinufawubovi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce63a6dfb8---zetixifu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a2763267d---bomizudimipaledevagerapo.pdfIn PDF document text
    • http://www.emailposte.com/pictures/buvewi.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/1545516443.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/gadolipe.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/38855123275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cual+es+la+relacion+entre+pedagogia+y+ciencias+de+la+educacionPDF 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_off000114b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B2 10936 bytes
SHA-256: 6ed506d2c4d7719c5e481d56f0b2bebbeb767d209364040b9d5110f4ecdd957a
font_01_sfnt_off00012df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF8 18872 bytes
SHA-256: 6e3aa3909da9186adda9214b3bfe7b0946d496f8c2e36665e5b66b296ca81597
font_02_sfnt_off00015d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1