Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d2d834ee957b48…

MALICIOUS

PDF

86.5 KB Created: 2021-07-30 16:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94ec50cb3145e4c6c50b3ea08f2d4d16 SHA-1: 776bac1fe45ef11451a069f2c564645d4db907e2 SHA-256: 23d2d834ee957b4817e2177ffccc0f70a5b32016e0d76613dcf77816946e24fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, 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. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/ac6130f2bd4f0a0f5de634d68c34a1ff/bejoleravesi.pdf
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/zoluvupozosilofufun.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d43966c3296---lelinoduluxetuwoj.pdf
    • http://kasargod.net/uploads/file/vutaga.pdf
    • http://royalgroup.at/tmp/16649663871.pdf
    • https://rowadalbyt.com/userfiles/files/80322545908.pdf
    • https://actor-conseil.com/files/file/zukajese.pdf
    • http://ghgunclub.com/clients/f/f3/f3036db30fa8ed97f94f648fc77c1040/File/faripifaradureliwudadeni.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3ec871d74---desiwekelemokawikuvalu.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/a6ggvbgjm4r7aep2jrt7hj0qk0/23147768651.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/larosumilofevapilewuwegib.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/3aavalro9a9k7phglgsf9svr07/ximifoxudotowixigeguvito.pdf
    • http://domholidays.com/userfiles/file/8411759772.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/tfn6hrqspn9ohbdf3227qhk5rj/98846987469.pdf
    • https://unicon-msk.ru/data/files/depadajilirudanapareki.pdf
    • https://aprilboya.com/userfiles/file/35899148751.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5320013d09126a666e4ac4317d997056/toxig.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/taj42k78cn1no2t0in9q4ms3p2/87379268922.pdf
    • http://familiesforfamilies.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/84472596960.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ver+benfica+tv+online+em+direto
    • 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_off0000ec84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 16792 bytes
font_01_sfnt_off0001049b.bin
c39a77decd565ef13593b0118b293e8a9e0a307527a342702507b7169934f879
pdf-font-stream PDF embedded font (sfnt) at offset 0x1049B 10644 bytes
font_02_sfnt_off00011cf3.bin
c3639743359ed28254e85847b8cde6663502b249906dc4728feacae556d6c874
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 19448 bytes