Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3ff316b1676a42…

MALICIOUS

PDF

148.5 KB Created: 2021-07-07 08:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bfe711ec33434bebfd633d6fe6641d91 SHA-1: 68603be4226cedfe57befdefb767a25c9b5ce9c7 SHA-256: 7a3ff316b1676a42c65f34695552fc5b6a9c06fa6df5b393a5444c81a2ee459f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ac67b8e1---pivasiwojakuwud.pdf In PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/rbnbbr9gja6gqilbaarp7hg6p1/78983877512.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/36407b6578d341bbc8382a7bfbc7e351/bubujome.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/rujewuwuxunubamafolager.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/bf7ce80e5ee39aeaa8fc5f19cbb53529/45772856076.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/eqtdb0qmo5ufc8b8k51plpf2d3/17137727405.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/p836n974h3k2i6kmrnt252j0q7/nofoti.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0937fe4bf2---92878028312.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/zukonovekejavedef.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97b9df67d---1138884736.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/nesipavunufofezoxamasol.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afdaea6847f---kiluleberajatola.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9533f3ef7---63152265506.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a81eef18---92368709416.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/53279976887.pdfIn PDF document text
    • http://fxmeat.com/upload/file/5cb091dfcb70a5783a284f71f06c9135.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/42938570466.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/a03e1343ff64e8b424a81551daf0a308/rutupalozapa.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/palenixelazemigisutis.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/2861524131.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/6n1sgod9s4fvihqtt5fdsinoil/81924968182.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c483ef4350b---rixanuzetaket.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/dixasalemakowigitaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=water+gas+shift+reaction+catalystPDF 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_off0001d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1B4 22624 bytes
SHA-256: de31d7c778be84e0c3a16751e30bd22828ff099922cfaa871e13c86ce51872ce
font_02_sfnt_off00022a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A06 10720 bytes
SHA-256: 797b3ceab7266d2449d4103c8244148fefe1c0b32cca7cd7b8b9fad164b1349c

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