Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c45b609f257c87…

MALICIOUS

PDF

130.2 KB Created: 2021-07-03 00:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9a3eb20d88250f09706ae841dde3b1dc SHA-1: fcf669a37c89ec65a85a3079d591e73b64c51430 SHA-256: f1c45b609f257c8736ba07810f329dd0bf24680b4cf87623692bbd7bb41c6c88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting it's used to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9665

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://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/aa0276f864ce7adfb6fed1afd184b59f/97711349770.pdf In PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/tf8ssup96mfl5bbaf4auui5u7e/26097127024.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d9e47a7b494992b906c7fa2273c39010/87206181411.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/32228611752.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e797229e7e34caf5bfc47b6b8a3a6356/fitafelogizadolan.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5e466a3ec---41435335262.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/79755830204.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/xewuwowozozinedikamo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/dgqbb5n9rp2jfcrptj1ca3ehb0/10664531981.pdfIn PDF document text
    • https://altbuket.ru/files/balemowobepuzefoxikediguf.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4122d49f361e36356316915ad55e5221/nujaferenamopimijorijexa.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f02485f2---sugeji.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/m76m55cuf4euv9bkpup12i7j6h/82802708101.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/0oamhht81sv7ep74k4bal8odt7/bovibalatugebonu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f5f5d608bce20e0473ebb115f0a93406/wenoviratetutabebo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e727ba9d5c---wisov.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/nuwuvoluvazugovidemefowus.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b9cd572f7b1b8195b3404fdee33e872b/40424887322.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062323490526.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/3962d5b96b7eabb5830c3b746baebbc7/sajisozigupodajin.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/xewupufodiwomimelekumeb.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/79eb5da6fa95030cf0d6c754c8b3ae9d/getajafevo.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d30be01263d99afd6c91f426ef8785fe/vadoworezavalof.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8fae360cc---kabegizususosan.pdfIn PDF document text
    • http://absigorta.come/file/1584017597.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/3mtfued5arr16qktfko4l2hlb5/kemoforupowigulidibezasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=metroid+coming+to+earthPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000183b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183B7 10596 bytes
SHA-256: bf88d87a88a64a8c273e5dd8e4944d8647bcb01b4efa11dd1db6567b6321187c
font_01_sfnt_off00019b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B76 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off0001b0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0EE 18108 bytes
SHA-256: a62edbd4182af7b07b8e4ec2f8a6a7175a41d3c1098e47f4421908eb8bd78961
font_03_sfnt_off0001e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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