Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ddc2521eaf0408…

MALICIOUS

PDF

83.9 KB Created: 2021-08-10 13:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b2a173837c0f688ae8bd457adbf01fe SHA-1: f4dc43ddab5df7848b35d0a81ea2af16802f4c28 SHA-256: b0ddc2521eaf04080d812cd5592a01d01c85dbd1082635145697808ff2361421
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9775

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://upaspor.com/resimler/files/41389299000.pdf In PDF document text
    • http://charontrade.hu/data/file/tumatumafasag.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4437af162d---71336004220.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826b19b997a---29658838938.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cd0dec65a---8341792070.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf459d604---83684687008.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/wimisinefozuzabutiwopu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf828b84211---3968274655.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/pegopizorajenofafud.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/78626641440.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/60c6cdc86269a7da07c2601b92dfbfbc/tefumapeki.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vomk4qdad30cu0a4kn0b7e05c6/jawagirejivo.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/39269851853.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/6a2575299939605d701bba7e1f5adede/94981217137.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877f0050ea2---56035288839.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/sojadekutevudajapemafuw.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c55b40601bb---jexodavefeweri.pdfIn PDF document text
    • https://menu2uplus.com/images/file/mizulu.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/91258460944.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2724e674---petisesisosekosi.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d51682d5beda8871746f48e744a48acd/14924482164.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/mebinirozeretirozu.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/junepudurunatazunet.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/90511594243.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/78567184565.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6d7052f40---tawuxepukuzuzeko.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/vuwabozigimaduxobogevibe.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0c656c10f---gusavowonadiduwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+song+kehne+ko+jashne+bahara+hai+mr+jattPDF 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_off0000cd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD97 11144 bytes
SHA-256: 7a7e6d765e843436388f632795a69d51bf7fd8d7be184d25f026fbd4414b050f
font_01_sfnt_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 16644 bytes
SHA-256: d380cbaf05d0c11206575711ca284ba6289d6a395a3bed75d261af2d9c5b00bb
font_03_sfnt_off00012785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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