Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b825c717d8f96a3…

MALICIOUS

PDF

77.0 KB Created: 2021-07-02 20:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7dfcbaaf348dd77a95cb036e8ea7f32 SHA-1: 95577dc0342167a46b431ba8574a1529a8d1b6a2 SHA-256: 9b825c717d8f96a38d3ab9e9ea019301f260e610434e77839b7af530fe30b769
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073ddea24701---16336650846.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/11cb3fdcbac52012f6054cdd10214698/8418092225.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/60ebdc40b3f777241a5b809e64247b1f/rabupojufixuvorosixet.pdf
    • http://jnnycc.org/userfiles/file/xizonenajopoxuson.pdf
    • https://loyallcanada.ca/editor_files/file/bazajaxasezo.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b56d1f489---22587992710.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b76321b8f68---lesupavuwafe.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748f2149688---timubosimuterugi.pdf
    • http://jjmcp.jp/userfiles/Image/file/zonotuxeweju.pdf
    • https://valstybestarnyba.com/upckfinder/files/59323528684.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/foladafabevewekija.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/49394093861.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c027488658d---kuvikur.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088c9abb7571---76543233855.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/p836n974h3k2i6kmrnt252j0q7/nofoti.pdf
    • http://eksan-ltd.com/userfiles/file/73946022449.pdf
    • https://et-auditing.com/userfiles/files/bolodozupomalapidatenaxen.pdf
    • http://chrisdepanneservices.com/Sites/cds/files/lenifenaxe.pdf
    • http://gandolfiarchitetti.com/userfiles/files/2962018230.pdf
    • https://hgb.se/filer/file/43907933772.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609889d73254c---93462256639.pdf
    • https://michelbarbot.com/upload/files/67452700382.pdf
    • https://marblo.ph/app/webroot/img/files/74798111102.pdf
    • https://bamfieldrental.com/userfiles/file/66121478538.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/aaee79de0ee52b5849a2ff62196a4c8f/kejezovozesasuviz.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c077c1957---jewuzibizorur.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=all+my+loving+chords+no+capo
    • 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_off0000c9aa.bin
7147249a56d95d3870944139be239f0f8f9d34253464f7ea92954033f9819a6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AA 17120 bytes
font_01_sfnt_off0000f5a9.bin
bd141547e156a97e2858a6c8a21e8e24c98765aa63aa9f06b47a08dbff489391
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 10892 bytes
font_02_sfnt_off00010e6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 16792 bytes