Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76c2df1f48774b7…

MALICIOUS

PDF

74.4 KB Created: 2021-09-02 18:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96fe0b62cab371cc7896627f68e839cc SHA-1: 21a5f435ff1c618aa3845a985d66c96d71af6657 SHA-256: d76c2df1f48774b77f172069939e804f509e8d33ffef83591b31ecd840c0b980
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nutranghongngoc.com/media/ftp/file/bizilodajodewarofumexirok.pdf
    • http://www.jysunshine-hotel.com/up_files/file/nubosoniwufojofugab.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/117a978faac5ba6dcb4753185eb1acaa/53128636157.pdf
    • http://jatyn.cn/upfiles/202105/file/1620963535.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793aaf83ccf---23085477507.pdf
    • http://tieulongcopro.com/luutru/files/65071222840.pdf
    • https://steklo-shik.ru/userfiles/file/kuzudapubuli.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611da76f8f652---59447561437.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/2800acff6daccbae79bba87ae2b912b8/metekexopurizepumu.pdf
    • http://balone.net/_upload/file///98250845419.pdf
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/48376168153.pdf
    • http://se-ty.ru/uploads/userfiles/file/2480682208.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad1e84724---pixuguvavijegi.pdf
    • https://alutat.com/data/file/15210284623.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a87901bcd---70693827386.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f8d8e157---47725745452.pdf
    • http://dzbnf.com/upload/file///65992373574.pdf
    • http://gorillatheory.com/admin/upload/file/3154168700.pdf
    • http://viquadro.com/userfiles/files/16276109661.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ci63jml290kinvlgqne6354kie/87494884922.pdf
    • http://studiozammuner.eu/userfiles/files/35931340718.pdf
    • https://triosms.com/userfiles/file/71497906090.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/e3t81if8p5erndeel8o4fpr3ck/16882721929.pdf
    • https://www.jdconstinc.com/ckfinder/userfiles/files/panetanopuro.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16093fa073138d---32240045211.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=vivitar+drc-333-wm+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bddb.bin
4d2fd68424804bb228dcf6a83a0c6654334a5f27eff40108da72911a35e987e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDB 10536 bytes
font_01_sfnt_off0000d5e8.bin
9d5f7b90edc393666ef47ed0bc029199857aaadf9435520d0262cac33f2ea1a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 17540 bytes
font_02_sfnt_off0001036e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 16792 bytes