Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad8a1aa9d00c208…

MALICIOUS

PDF

111.0 KB Created: 2021-08-01 04:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1806e7ae9107ca6bda194582ed02f3c SHA-1: 77a69b920ea8b3e7ec7f333ff09336c2abc0d988 SHA-256: 8ad8a1aa9d00c2089fe8f6e04db4d371d4c632c90c4364d8353ec7244ad62d79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and link farms suggests an attempt to lure users to external sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://pistant.ru/uplcv?utm_term=pebble+watch+faces+download+2018 PDF link annotation
    • http://bjaimama.com/data/upload/2021/05/file/202105121259019081.pdfIn PDF document text
    • http://screen.by/images/file/xasujores.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/6a4uhq2escvks1dqeb43dv4po2/zolazigudovuse.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/23971220708.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c68886f1e5b2f2a004df64c905afda2b/9687026566.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/f57686bfba001f2434821952e2806278/xuxonozekipaw.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608778cc31fa7---78505203298.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/8ooft6eqr836vuf1t8nqjbdco3/83358348996.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/99122084680.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/229c1deeae98d0a91c618734f3e6f118/jopuzixaleri.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/84a062c06997fc5d3c89cb86199367e3/sepabolijofanovoriwam.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/n5gaqf98re6pr0ids7ccbff0f0/70956823809.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3c8f2c4d7---gomiposomol.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/gapemavikuvewu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4f5c91a89a0cf7810e04535e58b29fc3/koketesupogijib.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/6a3679ea9fdd209ef169d84eb5488058/64772133618.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/23e82d6a5e6eb6cdc58692979c77ef61/melijetinujuzubewupugejev.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ca678b937e7---nujaberi.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/38163263645.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/44877929952.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/suroninej.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/vituvedovizeji.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/6o52ha8l5glkicqi380bff9tip/pubebelakabevuvobelut.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_off00014a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1A 18468 bytes
SHA-256: e2f992f53f198b05810ce25ca1cb56b059bcf0dcd79b06094216d0f81c23b21f
font_01_sfnt_off00017b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B48 11112 bytes
SHA-256: 8883dbe356b0d05ab421b2f03e6bec0a8cc79400f7f890e6ef9326b219635b10
font_02_sfnt_off00019559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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