Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a5cb1207e899d4…

MALICIOUS

PDF

95.0 KB Created: 2021-06-26 10:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 076b11b080fc962d2e389e6925610a60 SHA-1: 7e3c4247243db4cb12ecd4af4597e86cffee9b10 SHA-256: 74a5cb1207e899d493873d1322de7993097383aafb6b5971cd8d9220f21ee0dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://coretry.ru/uplcv?utm_term=how+to+list+multiple+quotes+in+a+sentence
    • http://immobilieninvestors.de/userfiles/file/rovew.pdf
    • http://hongshengfish.com/uploadfiles/2021052222322510410.pdf
    • http://amexeuro.com/an3_Uploads/file/13351810381.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f76d75e1e0---27387814760.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fc9be5994---78378451736.pdf
    • https://study4student.com/cache/fck_files/file/24874710356.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d026b5b4d---75756635152.pdf
    • http://auapp.ch/userfiles/files/pixuluzevog.pdf
    • http://jcon-aps.dk/userfiles/file/noxopovekixodokenebofe.pdf
    • http://studiogiovannone.com/userfiles/files/xosusuvabizabixazumetu.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d9133db6a1331cb179cf02052151b0d7/vabitosixekobob.pdf
    • http://apcmagon.com/userfiles/sinibekijaga.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ebe53933---11212257125.pdf
    • http://cbcom.eu/ressource/site-image/files/seduwimivepikizididatiwi.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/8b43fe29ca963a9b222693b003db1ae6/gazetotepozasupa.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607255e73cc55---46864932608.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075b8ce8493d---wumafegimoxubetuzadenu.pdf
    • http://jarosi.hu/files/file/nibogopamul.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a17838e882---siberetulupofosikes.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/fefb38ec24f653236da36670a280a50a/zidapawojow.pdf
    • https://uniqrelation.com/userfiles/file/tudoj.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87760bc308---tevaxarowidebegogoro.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/u27vrpkm3krlknpl1hshn8prpi/bizatadimugodasamasunofo.pdf
    • http://travelsi.ru/ckfinder/userfiles/files/tumaxu.pdf
    • 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_off00010ff4.bin
7b74cfe94f918cbef6d850c823391adf5f0ee78d1d53e21812aad25257d24796
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF4 10756 bytes
font_01_sfnt_off000128b4.bin
1b35ab3816cf1db361ad995258a65d9a3a50421f8c833b0c287cfcbe23482171
pdf-font-stream PDF embedded font (sfnt) at offset 0x128B4 17604 bytes
font_02_sfnt_off000156a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x156A9 16792 bytes