Malicious PDF — malware analysis report

Static analysis result for SHA-256 1859a5cb567b3388…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 10:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 968825efc4fe1d1df87641982a90fd78 SHA-1: b4a27307533c7c31bf8ef5226e6392248add0b38 SHA-256: 1859a5cb567b33880f0a9532251965eb3dca45a9e8c041d59affd2bcf33f7a0b
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The ML classifier strongly indicates maliciousness, and the presence of multiple external URIs and a link farm heuristic points towards an attempt to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or content-distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2c3423b78b3dda4118d95e0f835ffc84/vujuwigakekolidufex.pdf In PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/rejurijowepotumubewo.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109041705191798.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f53ca2b7be---27379392797.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/4380405586.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/24477691693.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/56599537148.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/57958586684.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109092200463560.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/xuremajexoxexolaw.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/98596038267.pdfIn PDF document text
    • http://enkepharma.com/upload/files/9261964.pdfIn PDF document text
    • http://izr.fr/files/81907996431.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c6f752fc4a09feafa3b7869664998365/gixikiligidazotirosa.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210908_160710.pdfPDF link annotation
    • http://agilesolutions.in/uploads/kagopup.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35ec88b5a---lerij.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/65187d21ce8728fcf1861771ecea3691/84247212763.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9a19a775d---kenorepetoj.pdfIn PDF document text
    • http://armanetti.com/images/84090534623.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613145c37aac1---masisat.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/dogevedonifebuwoze.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/sabomidiv.pdfIn PDF document text
    • http://abc-tel.ru/data/File/kebamomanepotujidi.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/43935672119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pubg+new+game+in+indiaPDF 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_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 17728 bytes
SHA-256: 0c76555289b4c174a58c677a9b52c19c81b349214b57c110c0b051e94e0edcbd
font_02_sfnt_off00012871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 10384 bytes
SHA-256: b4caec83b5222a33b14cc764fd9f7f4f7241a3c4649112de16d75cf24eb814d4

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