Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fe226b0e5a3008…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 21:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75491c53d25ccafd717a685514b03191 SHA-1: 37d2bc65a514ed47e7ef96daf4024dc8d24389f7 SHA-256: d9fe226b0e5a30088398b58129402849804662840d8e8be564334b992a20bb4b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised CMS uploads or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rescue119.org/userfiles/file/10801075294.pdf In PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/98155778352.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/fafab049c80868b21a8a37190101cb99/17142872191.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d97580b3d---dusibavolejomexixugolowu.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/54159525187.pdfIn PDF document text
    • https://triosms.com/userfiles/file/88982257823.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/molad.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/buwiro.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/kapijuwinu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135d8f524f71---92223333299.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/4599bfef86f72ea23db8935c357eac02/53847542244.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c637702558---zimimuxekosokupovu.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/33263329306.pdfIn PDF document text
    • http://kammed.com/userfiles/file/26865597063.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/59720682849.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6dcd47de---26774868233.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/fegoleworokigivasebuze.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1c7f36218---bapazutemab.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/netinilisawubogesokewaxup.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/r92tssjrk7igit2351h8t1qq8a/xisofukedudewod.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/gewesetiluzipepekujiluw.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/18359988495.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-11/20210911121558815574.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/migusenimibok.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/mukuwug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=nouns+beginning+with+kPDF 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_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 18212 bytes
SHA-256: 841f63a94ffd6a005c1cca3d51e1322b0c86537f5ad2e288b01326d88a40ec30
font_01_sfnt_off0001175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 10472 bytes
SHA-256: d0f58c85ab069934ed83b43dee4e812a356abf711555b7b3da14cbf72a4db4fe
font_02_sfnt_off00012f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1