Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34a07c4ff3c4a8c…

MALICIOUS

PDF

94.7 KB Created: 2021-08-09 22:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90963f5753d5662ee43d47b27ef5db61 SHA-1: 7fb65b56925748b75c69c2e3bf61020fcc0a862d SHA-256: a34a07c4ff3c4a8ce360fe51eaf6f2996a32cca19fee0c6666a13b89dec489aa
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress installations and disposable hosting domains, indicating an attempt to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users to these external resources, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://4grd.com/cmsimages/file/tekomizadizuputobefidex.pdf In PDF document text
    • http://brunagabriele.it/userfiles/files/wonavenogudololuwumasiviz.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/xiwurudavofep.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/ninafibefigajididorapa.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/fidepiduwemudoxor.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/32186996224.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/16395b0a82a434a2d47fb1ff214912f0/xanamifemavanoxuni.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1124dce1cfbd2ab9d42161eb3733785f/pimugemu.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/81573598733.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/99cdcddec316f22d4b893ec4a70bb91c/kowapojutakidipus.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/razeviwavuzi.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/47575073236.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1624078635.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/laboputazenomoduwijinaga.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/kexasiwavasam.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/91570102896.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/ebea20872f3b41f8259af0f67f1ddc63/71951911085.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/85837792379.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c5504b46dd7cede97e57ddeb71c530bc/46180070842.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63dfb26605---mubidojamex.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/c42hm8ddfhg34so1d6k2r2389g/jodojabitesavexonol.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9cj1el2uolr8bpvk6qdh3jl0e7/gofevividarojufonuvev.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/xokenutimolebiverofuz.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1vtdtkm55c57lppkl3au34kv2c/gigezovifafozivupu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cffea898251ab8ef649c9cac058e535a/masekuterevumu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc3ac90fc7---viworopowerapipiwebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=actividades+para+primer+grado+de+primaria+figuras+geometricasPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 10960 bytes
SHA-256: 0f5091a5de60865f7ce916282c81049b62184bcdf6f0f9a3d22d014b2f2a1c3c
font_01_sfnt_off00010d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_02_sfnt_off0001223c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223C 18320 bytes
SHA-256: 1bf379629eb1af58a3eb49d9727fc2e08c1377c1d10cddbb4c7593c5906498b6
font_03_sfnt_off00015172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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