Malicious PDF — malware analysis report

Static analysis result for SHA-256 b043c05fa175b27a…

MALICIOUS

PDF

94.2 KB Created: 2021-07-08 06:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b64783e8e7c553e84d08df161b76fa9 SHA-1: 84d4d5bdecd217af5b6bf372df7d0e2c415cf53f SHA-256: b043c05fa175b27af48d3ebac2d91171677f4add963bc7849d79e53f597785bd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farm indicators strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c03ef43b---76169662069.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b402c698d7b430e9989c4788eebfef1f/sefijadodem.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d0e22f28305668b4c06e3e2b1128f383/1929147977.pdf
    • http://teerosy.com/ipp/images/uploads/files/16665319000.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba18b1670f---57524585815.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073ed9c334c5---xudiwipad.pdf
    • https://marosme.ro/hirek/file/59592418737.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/gamoturuzedodumuduwota.pdf
    • http://cuatro-pr.org/sites/default/files/file/vojevunerijunipugu.pdf
    • https://lescourailleurs.com/upload/editor/file/77021306111.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/67219d52bb9ac19c69900fbd2f25ad78/91340928785.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757d642a133---ravumuzamawi.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/79196adf0acfe8870ccacd105ebe114b/vafokokifavosipetut.pdf
    • https://menuiserie-sainte-anne.fr/userfiles/file/93955140745.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ke3ug1bbdgv7o1drbfv0c8ecc0/remepewofisevuwoluzibedim.pdf
    • http://stringquartet.biz/web/images/fck/file/24587251415.pdf
    • http://villaelen.it/userfiles/files/13404053500.pdf
    • http://icltindia.in/userfiles/file/99416191795.pdf
    • http://bularz-auto.pl/images/userfiles/file/46099273352.pdf
    • https://108pizza.pl/uploads/userfiles/files/xagifubexulovofarobin.pdf
    • http://madmojo.com/fckupload/file/lovenimepuk.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160805b741acbe---38001321146.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d8434ce8f5d38c8a7c0f742dd25bf557/38643487862.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vgt+dividend+yield
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000134f9.bin
d42dc060ba0fb206f0e9333f030e7db79a61eb94a11133afdf677fc4accca25c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x134F9 18372 bytes
font_00_sfnt_off0000e9a6.bin
069ff6a8f0e7dab775f8e4a8a473052aa03d4b574b781895073b7edc0b198108
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 10024 bytes
font_01_sfnt_off0000ffc1.bin
45617b206c3f5be1cd1d50b3f42d31093cbfd4dae01257e04ec74f7e8d533fe5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 20272 bytes
font_03_sfnt_off000151ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x151CA 16792 bytes