Malicious PDF — malware analysis report

Static analysis result for SHA-256 520ba83a65cba104…

MALICIOUS

PDF

100.1 KB Created: 2021-07-04 02:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47f2d34ad5ceff99b84280cfa53fcca0 SHA-1: 457439cad738ce754c441529a7ad748aee4adbd7 SHA-256: 520ba83a65cba104dba028247def6d2355703277a5c74c1bf92b66c9ef5f3240
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, directing users to multiple compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b598fe0ae84---mokazetugivitibane.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086b385a1b3e---zusepixetofigojipe.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607662999a6b9---tomaliwetepos.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501010857427020.pdf
    • http://gd-weimi.com/upfolder/e/files/20210621190152.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ml6glfhkmh4vo3rp7abtshh192/55661203874.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/7bmuvoitd32n3o5lmip2ir4d5j/motowofune.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/j4r5m8sfj9ssec0tl7hmdcq6f4/folapuvu.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/60008ffe1c1d1b2e0e3dc7472a98d547/dufopudasivujelezis.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/536300dfeb85c2f4d6295a10e21bc99f/jupekag.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608980827af1a---pegaxumubaditux.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/livipinowewafuzivajumiv.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160733ff5a7013---47643043184.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775251a020a---fesotezofidexukusolelu.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fbca71566---wuxiwazikelitewo.pdf
    • http://suachuathietbi.com/upload/files/sagasuvuduximaduxujube.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609423eae45b4---53617629424.pdf
    • http://samafb.org/uploadfilefiles/jexitepulazenoxaruwi.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a7bad63ad4c1b7eb2bcce1d048ff586e/43788546106.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/fed4dd4666a6cd0fbf58a9160ae03ac6/66778973903.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4f3b898b9192f72ff5b41c90aa49506a/84733449638.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ie9c94hcsjkod8ek22t9c10eqv/4212590304.pdf
    • http://aloeverajuice.cz/files/file/50215975984.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fun+things+to+do+with+friends+in+minecraft
    • 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_off000125cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 16792 bytes
font_01_sfnt_off00013de2.bin
4aa7ec2096600d8365ebe99351b0c795b0de032c7836564b2024608c88c40801
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE2 11040 bytes
font_02_sfnt_off0001573d.bin
0ee910c8660f2ab582b1fcb2c5fe7189e24fde4edbb77195b628e3d6540582aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1573D 16720 bytes