Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f31d76261cd622…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 23:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e987b9fda623a162c96aeccec3d7dd4 SHA-1: a93028dd24df66186fbf5b3d6d087389f1b953a7 SHA-256: 15f31d76261cd622ac9a73378f3f8a068edd4fbbb53460d5b8584a84df4f5907
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm pointing to compromised WordPress sites, suggesting it's used to distribute further malicious content or phish users. The presence of numerous unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16138079251b9b---wubabatokokigoko.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161327e707236a---razumibakumuvafa.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/59927712192.pdfIn PDF document text
    • https://insp.biz/img/file/65232838953.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/ramabamobovegisazajutuvuk.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/70772859747.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/puzapilevefufe.pdfIn PDF document text
    • http://chineseclothingonline.net/File/30500321141.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/11064298913.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/2799c47cc3b75db2eb19045327e73adb/89697455669.pdfIn PDF document text
    • http://hkacca.com/userfiles/lemutiloforedubowuna.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/99917869890.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/jominoremebemivexaxetudo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407eda1ff1f---82390797903.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/kupol.pdfIn PDF document text
    • https://botroul.be/uploads/12913978819.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/63212bebfe0c7bfda314b24962fcc9c0/xuzek.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/nurul.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/93054568629.pdfIn PDF document text
    • https://kuepancong.com/contents/files/mujosisezumijakabaxujiwo.pdfIn PDF document text
    • http://manu-transport.com/documents/file/64002334218.pdfIn PDF document text
    • http://dmkert.hu/files/file/mumotuxuvadinusofipen.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/4199746756.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/gumefor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=can+i+use+office+365+on+android+tabletPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/xazefedejeg.pdfIn PDF document text
    • 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_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 17496 bytes
SHA-256: b5e8b0667019b0f67f8f3d35431e4f705d9d718dea93bde9954a39787bb38595
font_01_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12730 11216 bytes
SHA-256: ec610d1e5e38826c61edbd69be65423da188b493acafa926cfa080943c830627

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