Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b4e7e545b989b0…

MALICIOUS

PDF

90.9 KB Created: 2021-07-17 18:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4cf22a9e32fac9bddd41ef8123442e53 SHA-1: be56e1fccb822649bab53cf89c5bd2067e589cd6 SHA-256: 54b4e7e545b989b0dd78117968ffe65c0920ab77f91e79117f928d5fe5af663c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://cakenepal.com/userfiles/file/83954337999.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b50feda502376797220653401a0e00f0/68440094995.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/dixobapaw.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/77cbd149f782a3ff28d7d9061669ae9c/tojirafulujazo.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/14544f8549ad12f2f855a3b767152021/47153820573.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/tiu0fvm9e9sl3iogkj1osdqaam/56622295777.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/663b6b66b2631b5bb4e6be06c889e45a/ragozejomu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0606729a6ae35fa5695a5ad75a8dcd07/wuzinireseketawafu.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/sidudu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930088cd96f---jakojelasebunus.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e624a56d7079417fe7e3b4bac728f526/wekagelilal.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/29323089617.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/80670755296.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/senotenoxufanifawijuwoda.pdfIn PDF document text
    • http://aa-nusd.jp/kogasamejejenati.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac81d6c269---34502000054.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/60081700853.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096455b4acff---xuvebinozubop.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/sojefediliku.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4c30937bf020ea36e41e373c1a146110/sovilefuxubizifewaxifene.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qi94oc47vchu3u5s6rvuam1gh0/38592975887.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef775cfcae---tolifolunolupuleb.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/kigulalatagaxabawonas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=easy+chicken+and+dressing+recipePDF 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_off00010000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 17508 bytes
SHA-256: 3edfb20b88eb9c99bf02f66b1b8d6619271aebb666c5e611aa5626ac819d17bc
font_01_sfnt_off00012dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCD 10720 bytes
SHA-256: 2d27f36980c617a03493884fe5aa5b969256fbef105d9ffe92abb06216c67623
font_02_sfnt_off00014627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1