Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f41c465ae6259e…

MALICIOUS

PDF

86.8 KB Created: 2021-07-03 02:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e689460a959955df393b6c8f21e9a430 SHA-1: 3ae9f1d51a645841e2c4f5e9d31a2c639d72308a SHA-256: 25f41c465ae6259ecd3e3cee720d5c4f6fdfe46a6238ae5c6eab38ec89dd8ff1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links hosted on compromised WordPress sites, indicating a link farm designed to funnel users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e90dfec9---9680534997.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/nafefavojabuxopitonowop.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/8b60493eca9e0dfc895e2b360c378bc5/tewajojolufemisurakuxi.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085073bd576e---ziwebeweji.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8d5d6a3e9ab31281372b2cd3a8ff4299/bafuwolatokukuw.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8978ab363---15190865970.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/874fe46386b8523a34d48985d084bb4a/dezizavafamipobifokogafi.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade00684882---bepotofixefamalo.pdf
    • https://promise-land.com/upload/file/zupisazuvosugene.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ev74lvr2vo807uav8jfbqupvjd/mejenipolafetulejiboju.pdf
    • http://fixafilm.se/userfiles/file/sezofutowakuxosegorelef.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cf31693d4---vovebefexuxamomuxu.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/ede4e854f6f97d7d4ab6002edd6738d2/kiwidugewuw.pdf
    • http://miwon.com.vn/app/webroot/uploads/files/sawirurerexoferikotavid.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f9c79cc70---82116799659.pdf
    • https://n-v-v.dk/userfiles/file/62997096287.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4e33bcb9c---95898741346.pdf
    • https://juhaszautovill.hu/userfiles/file/suwozumotuzum.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/78314806519.pdf
    • https://i3mit.com/shopadmin/upload/files/49725860486.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/39957450470.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160945b8caa3ad---torokomigosu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mood+stabilizers+side+effects
    • 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_off0000f0a3.bin
e7181abb24ca17c3a1c7ec98f41634353fe1c9b084f1d7a4bd26fa620ff28fee
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 10560 bytes
font_01_sfnt_off000108e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 16792 bytes
font_02_sfnt_off000120f6.bin
a2438d39e0c7c99272ec825c4076425f53afb0883864b7464e9fc69b1b8d8f53
pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 17236 bytes