Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd210a69ae5dbb6…

MALICIOUS

PDF

84.1 KB Created: 2021-06-28 15:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26d265a28468ee691e0a7e255db50466 SHA-1: c69eec22cd0d5ee027cddb9845adc55a7aa69295 SHA-256: 7fd210a69ae5dbb608cf20aef816323f890bf1b69ebb9715ec0a652317c060e8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d005d2b6c1---77132580574.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5854be6fd---binukudefigodobi.pdf
    • http://www.sport-konyv.hu/userfiles/file/luvetevezosi.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f14ce4fdf5c77f3c001aa6b91a9c126b/farogok.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f231655c1d8e30c658bc4320805685b7/wuxaredotalobilupaw.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5cd1935eb7b7358c64cd9198ab41c4ac/69148903057.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63557d1487---89147290131.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d55f67c79e2---84189223150.pdf
    • https://xistenze.com/files/files/77063052414.pdf
    • http://marketypik.pl/zdjecia/fck/file/89788100365.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087dffbc2839---rakoginulilamajo.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97d9a39271---wizerotedudubagolegixito.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9c0ef76f56228ead8aeca6a56facafe6/3103641111.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eda5286d2---88163771083.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/45k9sml129are1dfojm01bp3l6/taxodalipudibugipuwavazo.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/56dea10f3026890267a95e46efe962ad/vikobupizilalizowomej.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fdef3f869830e27fd1b09ad5267b434f/dijanad.pdf
    • http://sacoorhealth.pt/site/upload/file/7614144425.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077bcddbe8b2---58927751368.pdf
    • https://alianzatours.com/imagenes/file/26239078528.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1c3b6dcf4eee772739be447fdae65444/pawuzowipitijugibulukiro.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cat+meows+every+morning
    • 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_off0000e8c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 16792 bytes
font_01_sfnt_off000100d7.bin
b9e63626ed786b99999d2e382975846f98dccb857e03da7aa32f7214b2261ec1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 16480 bytes
font_02_sfnt_off00012b90.bin
614f9f3214ea80507ecda90b865414ec1270887f4c24d9c8705a13ab9721dd3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B90 10704 bytes