Malicious PDF — malware analysis report

Static analysis result for SHA-256 e683b1337684b12e…

MALICIOUS

PDF

88.4 KB Created: 2021-09-06 21:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7a4ee2ab273cf48635d98cc26c2de4e SHA-1: 5a901a71866182e056201a2fb90486417fd1f678 SHA-256: e683b1337684b12e54bb9610c412e4314ad7104e6a86af4bc4fa4ca7dcf4c53d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, which are likely intended to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/judemali.pdf In PDF document text
    • https://skatrip.com/basefile/skatripcom/files/41746241339.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6dcc4b3ce---jajadog.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dda58b042c05a1e18f704d6200787826/gotejaregexunagew.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68ee238013763e9bed3367328c3ae287/55001490521.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/69929247509.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d07e7fbed7e---65534741503.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/waxesav.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5d087f61---8136126171.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mbk5qimrmk2fejc6gj13e27oi9/letedajepubiva.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pasp7sk298fk29bgq9h65mgki0/lagoxitogelid.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/wolasidizifajidudijem.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94757c916---bipik.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/ruravubopokiru.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f2dc15122---57181763181.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/domorit.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/80467212964.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/88449056318.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c91b53ac0---77732115571.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/27922153330.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/nosalulamive.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/42381827443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=interesting+facts+about+the+world+pdfPDF 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_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 17820 bytes
SHA-256: 667e1bd9a445023a28852d53d90c2170e5f0613599f268ee1468422453556f7f
font_01_sfnt_off00012212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12212 11176 bytes
SHA-256: 22b1db71cb7f85c93635e49964f2b88306091c441637c8af6d60983d7e9ae02e
font_02_sfnt_off00013bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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