Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f82838ed120fc2…

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 20:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c769dad1571103ca63fcafc2d261cf1 SHA-1: fc6e2900d335c7458fc6f6728f3e7aa2395af126 SHA-256: 91f82838ed120fc2d40de0160052af5a25d11db8e21a2ed2c6dbbc06d70825ea
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The presence of multiple external URIs and link farm characteristics suggests an attempt to redirect users to malicious content or exploit compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jkohut.pl/file/pimozaxodezupapes.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/52da75ff4803ece4d402fb8c4ddec2af/fovomeja.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/zosasozegu.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/kinijusere.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd3429da776---kilefivatawemakijuramese.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/m0en8kunqed43ldbu96lg1std8/jolomizanulaxagibun.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99ed87e18e---putoxexexoludosanepogog.pdfIn PDF document text
    • https://sainaudit.mn/File/venorodimigopotefifusek.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff1597c73---sesadamixabepufejis.pdfIn PDF document text
    • http://aps-mes.com/files/file/zedukodulasa.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/kozazolon.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/57385447577.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/78112585999.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/vutevilo.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/72527395305.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e368a741---zatajivuwolowawuzera.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f284ff2fa7---29730594755.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/lofifojetimumelelepa.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/lowupemusimabejemise.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/vimafomiwomenetuwuvimip.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/85459122052.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c0b5daf8d3843c91ef9e9d9413826043/teresofaw.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/27279833170.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/51636701616.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/semawunetazewediv.pdfIn PDF document text
    • http://teakdeck.pl/files/file/fukomulutedalosup.pdfIn PDF document text
    • http://beril.cz/userfiles/file/32203607996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lg+oled55c8pua+owner%27s+manualPDF 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_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 17440 bytes
SHA-256: 4f35037bf1387143ccea92c63b8578ef4459548560c385e3350b61d00962392b
font_02_sfnt_off00012b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B22 11188 bytes
SHA-256: d96e23da107d733f50045da445aa757d6436fc7abc63dc1b9310169acba4677f