Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d037f102018dcc3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 14:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 343dad5d78a9db07b8e865371212ab43 SHA-1: 9e8855037b2789ac27d219bb30d48204fa104ca5 SHA-256: 7d037f102018dcc349dd4a1ebcd66ecac760fb75b9b3d01c41284c6be0f496f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=show+weather+in+notification+bar+android PDF link annotation
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/ed7177fd58a0b8ee10b372cf21ba0f15/lubifetuwefuxusedom.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/da03f2a886e15be30406054c424e70d8/figevoligabiwepolivolekum.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/vavovakeduwajuvizopexivuz.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/gabajopazojakega.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/vikejo.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/db091c9856b60061b9d1a6ece5ad01d4/tiborabadi.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/xakerozozonizofizupodaxur.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/27133257908.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/kogegozapegimelomevesejis.pdfIn PDF document text
    • http://fygl.net/uploads/file/132330556103.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/63465527715.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/73763278636.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/sodewebozabinafivumubel.pdfIn PDF document text
    • http://mdtrend.hu/files/file/jalebuxamupuwemifibuwepu.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/67372750676.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/bumawirixirujebuxijupizo.pdfIn PDF document text
    • http://tfforming.ru/d/files/77414938806.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140269744755---pozuzi.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021961748289578.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/43365750859.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bac57dbd6b---82242070174.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/60348530222.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141df73c0909---xevulewogepabafozuralib.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/kovefulijadirod.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB967 10660 bytes
SHA-256: 650764f757b425d452c9c56b012b8f7c7a8ecb1c37ebe17445037baa65f16e72
font_01_sfnt_off0000d1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D8 16736 bytes
SHA-256: 2d6ddc9eb3d9744c64fd03650c40152760fcf891be414d8c241f5ce3b05f74e9
font_02_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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