Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70c7200cf2980a9…

MALICIOUS

PDF

73.7 KB Created: 2021-08-18 01:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8a80d42d633c2b1e37ca0fd46dae4395 SHA-1: 9f7644fbd11e3d1610ac7115da88c850c94a83df SHA-256: c70c7200cf2980a9133718a2cc3d583958aaf818bb3b1fb35c1c5ea2b2a6e95f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm hosted on compromised WordPress sites, likely intended to lure users into downloading a password-protected archive, a common tactic to bypass gateway security. The document body is unreadable, but the heuristics strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a79855bd88c---vejanujodisoworika.pdf In PDF document text
    • http://kukdae.com/files/fckeditor/file/71234337723.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/vekudinewusaru.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/89544332870.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/57fbccdadcc07eb2132277390d6ecd32/14055792633.pdfIn PDF document text
    • https://ovalpolycoats.com/media/89685857913.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f9c33cb09---96285632991.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/87317954036.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/85794602925.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/16c842aa51c3613d7235ed56eed98295/katafosenebeluwuved.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/99kogt2o28lj6fsnb30nl4utt5/2552687153.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/dae9d3162cf8a9c1d5ad8a95584a180c/32316055250.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/99556426227.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01d32aa40c---divex.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c4d4f5e39012c02bd2460303c87d9c2e/bevuzofifid.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16091d046551ed---xisirozobenuna.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/92bcd7dc64509081c972f4edb7c8cd1f/lulutedozisi.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/peninuba.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/18654280108.pdfIn PDF document text
    • http://oilspecchem.com/files/fozetutirela.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac08a659c---tutajetavemapusakibezijo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/95dcc72f4f99c2345b411eece00444f6/17860558433.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/18231028544.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0005e8cc8---loziramakexojekogajorejo.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/siwifelo.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160720a667834d---25641836099.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad44448fec8c3489b3eff32930fbfe3f/27893724948.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b85f92094a7d3b9dbbcdf73fa81c520d/mumebawen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=como+ver+senha+do+wifi+salva+no+celularPDF 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_off0000bed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 16332 bytes
SHA-256: 2e05117d2d26ac4d8f414760f15be556272c8ae5356f132ce5d6eb58cf20a9a7
font_02_sfnt_off0000fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 10924 bytes
SHA-256: e798f76d4b1d205944c15c9187cf3eb732ea909457d17ac7627de103978a0d4d

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