Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fd1d6b4763a868…

MALICIOUS

PDF

86.2 KB Created: 2021-06-25 12:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bea5b92a13f20863f0d16948212ebd68 SHA-1: c76df3e5ea4e8787c6e742b2cd7681138a382e38 SHA-256: 71fd1d6b4763a868de1927e0805f7d6e460a2f619dcd436d7232a7cd15f3e973
164 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 redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of a 'download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8v97m4vfl9cbce2qivu2j7jcug/47790806811.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/7a8ade932bc61fc1178aa3d150282744/28178420140.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607723b5c353d---33583608490.pdf
    • http://daehwa.info/uploaded/file/roxejusujorobixapejotox.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/q5bl22n4s8fu7idqqpnap430kg/96851613759.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c5fb94f614447b5765dad1e3c0d6a3a/24742213308.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/4e9e6ab9981bf2419f8a4ce7a4eff104/71290861917.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf244daa3---xovowojuvujowevunujazele.pdf
    • http://supermarketdv.ru/files/file/putafifaz.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac766b4d608---naresozexa.pdf
    • http://gocreate.termall.pl/upload/fck/file/10716722917.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5bf1a45e905359c8fff1f90c43e223f4/42185329450.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d872cbb2ee---81266025802.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c82a1c2a9e---zatigejitotesover.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=i+am+number+four+2+full+movie+download+in+tamil
    • 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_off0000eee5.bin
67870c5f86c152146f382ba865906703816c50006209b21754dac678b3b4d68b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 16988 bytes
font_01_sfnt_off00011b2e.bin
1976701284e403a5628d7f6724fefe19222b9490a6fa76a573ab00b854f23a0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 10808 bytes
font_02_sfnt_off0001341f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 16792 bytes

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