Malicious PDF — malware analysis report

Static analysis result for SHA-256 08833ef3a3f2084e…

MALICIOUS

PDF

76.5 KB Created: 2021-06-30 11:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e11baba53187ef95adb9216da9ef58b SHA-1: ae2c08e969d5cf1e401c449de6ddc7c5c2c5bad5 SHA-256: 08833ef3a3f2084e272feb3781d9c1eb801a93762fdce256ab6d9498dcdf4a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL targets are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/bubakom400pe46h62s7qpi4iar/titizo.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0d1805b154a3513c8b92e8fb758c5617/64536289492.pdf
    • http://eltonltd.ru/sites/default/files/uploads/513625758.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071b0ae05c2f---38918613397.pdf
    • http://thietbimaugiao.vn/Images_upload/files/tezewomojukewerovi.pdf
    • http://allaboutdowney.com/userimages/28502993281.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160beaf8810f15---tugutowazadexumax.pdf
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/e1f57515524fdc0953530651ac70b76a/45137144579.pdf
    • http://sola-brothers.com/userfiles/file/nekuwaxutatexafi.pdf
    • http://panziofabian.hu/fck_kepek/levupotosadilufivakezoxel.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4c4d9cc8f---96169400847.pdf
    • https://adsbudget.net/userfiles/file/nidemazanasuzoxiv.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c18c33096ce4a7c525985ea021ba3351/26856842508.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2142721037f45086ea7429e320ea4ca4/247694949.pdf
    • http://colorfulmedia.de/fotki/fotki/file/69740610756.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9bef85922---37701465794.pdf
    • https://muratay.nl/userfiles/file/puropetedomenodapiliped.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4a1d3078---jisome.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/20747364670.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68db245b8c---jedolasawaxajije.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f9d87f1557ccf18419ef8d872428d518/kapanagivorodotigata.pdf
    • http://seabeachthailand.com/UserFiles/file/tifotapebetusaxipovimokuf.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/kmg9talo7omganab50qvqd24j0/91020887895.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=join+two+pdfs+together
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c869.bin
12ccd58947a87ea454919cc82eb106420d184f4796a5bbd3d3b80201d58b9f28
pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 10648 bytes
font_01_sfnt_off0000e09c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 16792 bytes
font_02_sfnt_off0000f8ae.bin
7212aa9291ff2f7eebccdc82ffb82f24fa548d9965ab3652ed80394472cbe384
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 16980 bytes