Malicious PDF — malware analysis report

Static analysis result for SHA-256 1516179122b05e63…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 02:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 391b9e4d0fc7da9b9fe07d654c6022b5 SHA-1: c8ea0ae668da3f4be0576baf3fa7c5a3ff5b3d00 SHA-256: 1516179122b05e6363f3767ca7eaae8172978e245d4a449096036f85dcd38b00
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics and URLs suggest a lure to trick users into clicking links that lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ed7c4e42d56ca87664a2679a9b33cca4/merubugiji.pdf In PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160866d7a506ab---kinujokojimonedurutalupiw.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7a5532ba4---ginetukezakimezalaxo.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc2354f8e5---85689806137.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/zesubajumarifufiveziluroz.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/bopevijifu.pdfIn PDF document text
    • https://ebooksweb.net/files/file/moxodaribit.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/45646561818.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/gonuvomedigosotubodanibe.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd09f271675---75540139205.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d54f625a8---34744863878.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f342c1fd0f---fakamatipiv.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bc04030ed---5212026910.pdfIn PDF document text
    • http://deauville.ru/files/file/38008063087.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d6193c0be---gajoxagedanejovebowamijuw.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/nixejurewugarire.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210706_FDB77862872DA3DE.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ec2bea84f---dojuxof.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/8acf0b7894f3f8a359ecfdc8e2a38600/fukujoxif.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/76112122307.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/menufir.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wexefuwomoxizufojajevad.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/44136112884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nmc+bill+details+pdf+2019PDF link annotation
    • https://rb.gy/xz1srtIn 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_off0000d30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 17032 bytes
SHA-256: 4224d370ffa1719023de07db70de49a222fa062a1eb655061d2a48ed04fdf37f
font_02_sfnt_off00011731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11731 11036 bytes
SHA-256: 5563746f69a666ade86860b5ace4e8be01f71d4ee343582ace7d8c9c53b5b836

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