Malicious PDF — malware analysis report

Static analysis result for SHA-256 460faa1b72d5f2ac…

MALICIOUS

PDF

86.4 KB Created: 2021-06-25 12:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6e131c5ff1ec1e6eaa2a6c65322aebd SHA-1: 5e478fd076aa4826626bb0290d1171be08651713 SHA-256: 460faa1b72d5f2ac78caf498e5e9f96934c9df15416a9f0d23ed4a00938e4f86
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV and an ML classifier identified this PDF as malicious, specifically a phishing trojan. The presence of multiple external URIs and compromised CMS upload links strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=notes+of+bsc+1st+year+zoology
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609baa14bf0f0---26091361615.pdf
    • http://bigpictureresources.com/userfilesbigpicture/file/supupuwokunolopigegerer.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9a5525e88---47585550940.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33af38b36---93501341000.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/84235885429.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4f40d958c1220c7c23194ebedb735316/mebenosexalewas.pdf
    • http://soupworld.de/upload/file/nobupiroveba.pdf
    • https://dannysacademy.com/ckfinder/userfiles/files/54297425753.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/743972c9a9a98a42f20f8f1c03eee186/tofadotufovanodakefu.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4b59b56be---tajuzode.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9d61e1185061fb3885bd7c47471b73d0/77099708302.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609119c38b9fb---dirozevajesone.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/cur5163n0e1j4mhpff7nijhomk/xuwigonimorulenol.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160766e856990f---53989953343.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856538a1875---18669825829.pdf
    • 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_off0000ea6f.bin
776be794bfdb2aa67a0d8395aa243b584fe2043e6b1afb14d4d5da1f4dc2fe4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 18196 bytes
font_01_sfnt_off00011a63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A63 16792 bytes
font_02_sfnt_off0001327a.bin
6c6cb14f59e21ea4435a1efdd53f96067087bd6f94ca722a08ad678399847302		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1327A 10656 bytes

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