Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40bfd1cae3f8159…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 06:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd6eb74e790d355a23f41b45b5488214 SHA-1: 78794c2b9bb90af6c4b460fdce29cafa21d73f0c SHA-256: f40bfd1cae3f8159575c8e27f03cfdf5b9cd0eab9eb67ccfdb0675e017ed6c00
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload locations. The presence of numerous unknown URLs suggests a distribution mechanism for phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ias2tbpimnkm9eob9beteg1f5b/mozolufizusudoje.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160984342074c1---83113261544.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/me3dnqbkscvqt6u3dcfd2dk3c0/tulawomilat.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/77464373623.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49eafbff6d---38454008736.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/nijikotarog.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/digoxafufipim.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1645b232b8---tujolimogagumudipab.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8a19a28e7359270f1c5a865828d2fa11/xamarajozuredubofexosir.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/79761199358.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/10343064622.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/31156779969.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5gre4je45rurt6ufi4fo0nvi4m/89190987771.pdfIn PDF document text
    • https://mimpidia.com/contents//files/mevujoti.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16123ce3e67577---94580364604.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/44828331056.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/rojopekiluvilez.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/48762440251.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/465c6010135cb873cfc4b60deeae76e3/botoxekawububemov.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/belenozunigulatemo.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/garufikelujegejetaje.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/tovugigedixidojuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=norcold+rv+refrigerator+n621+manualPDF 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_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 18660 bytes
SHA-256: d44bcecefa33d7eee51eb9cd6d307f797b65d4af0a6bcd3e7682acfe2a39556e
font_02_sfnt_off00012a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8B 11132 bytes
SHA-256: 6401166901df98e08b142c1b018addfb39911bf4f95c32831b24b3f6af6a7cb8

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