Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7b763fcc6fac42…

MALICIOUS

PDF

122.9 KB Created: 2021-07-02 04:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b89da6f28e05a8c31745d48a6056294 SHA-1: c6f9191b4ce31cf220c86967b537e6cd362eafb2 SHA-256: 4e7b763fcc6fac42a0938a323292b8ee73f3486b6ee585638f43ebb1fea1e5e8
196 Risk Score

Malware Insights

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

The file is a PDF document that exhibits characteristics of an advance-fee scam, aiming to trick users into downloading further malicious content. Multiple heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3d66dd4c---wobusepanajopu.pdf
    • https://twr1115.net/files/fckeditor/file/sabufagaragagilufanumaxu.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc561103fc---gigumelabofebufoxut.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ef3be3ca---26168489430.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a380b9d1ca0---9587117821.pdf
    • https://hotel-la-licorne.fr/userfiles/file/wibekuvefodada.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e79115db89f02eb4e7de267c0d0b9ac5/xaxikul.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/adf6484ccab055ef9dd268f47f68ab99/51850047661.pdf
    • https://hostmegasoft.com/calisma2/files/uploads/midavigidajik.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086c7e5ccd58---57857145204.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bca1abef3aa---gexetupo.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d134e59c1b---41221900662.pdf
    • http://etcad.net/np/upfile/file/zimaja.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/kenot.pdf
    • http://mazdooradda.com/userfiles/file/76886701639.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab693bf2b---74871971072.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c559b798fed34ffbb969b2cf77f0345b/dufupilakudizu.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725d853c112---42715054016.pdf
    • http://meta-min.com/files/73648148862.pdf
    • https://fallsplat.se/file/kugusurog.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b62ea21546---44532407329.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/67cop2tfa49kc7bqr3tev231t9/petuxodanaxobo.pdf
    • http://novussiteyonetimi.com/uploads/file/sawadigozosinarirenim.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/ed534f6441ae8285cc888c90c6f37c60/vibizubezewosizeval.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bcc9dbb88a3eb0c7def3ec267992e9e1/64472400136.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pdf+opener+android
    • 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_off00018187.bin
ff2c4d12072ec26858ce32703e94a64c924e738af16674dada580d8ae800d91e
pdf-font-stream PDF embedded font (sfnt) at offset 0x18187 10180 bytes
font_01_sfnt_off00019855.bin
9ac4214c044e71cce05c0301e1ce0e2de570eee7409aa536ad20dd0d2051a693
pdf-font-stream PDF embedded font (sfnt) at offset 0x19855 17600 bytes
font_02_sfnt_off0001c624.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C624 16792 bytes