Malicious PDF — malware analysis report

Static analysis result for SHA-256 08be0650e1acfb1c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 02:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5867e22cbc0189d99204e64a6b057340 SHA-1: 5ce6e0b361e303c607a68457d2b3258265c9bc58 SHA-256: 08be0650e1acfb1ceb1c27c09ec617d954c1837e0b223016e5e39e37caddf20c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=ifrit+arma+3 PDF link annotation
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b586748aad3---fufajizirakadafobu.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/89744338752.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/95476878173.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/4e5edeb3f1cdc4846c9925a811566d68/gubaromalup.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c9162ae0aa61825f61fffa505e824c97/99652146835.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/81aae2705c348d0e0e50fc325dfdf8c6/73799557246.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/mosotorimufomuxede.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/xazexoxonelalerukafod.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/43993377279.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/gudewunitagisoxixukinate.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210611_030406.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/19275884898.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/518266ec5ae56a242509ed12549f33cc/jadagagutuperoz.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/94344748773.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/s5h1htimse5ti0ulkqcrhe7cu3/5212753953.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/49403665222.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/fvuc9jvn4p4lgvv7p4jna0u905/xubibovep.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/uu7ojqndigaotinfedgbkj1qd0/winuzewobibulajop.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/visegilipemarutus.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/29c513d31abe779669960f00b838963b/dubilisunorinutovose.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a18fa8e255f---gokepefakimamesaletuk.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608654d62dd37---88806829943.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/biwolefepijumedetib.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_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 18768 bytes
SHA-256: cb0a52b735b457eafa06d28379af8e1a615de14e91475f300744e9ce6d376d96
font_01_sfnt_off00011832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11832 9928 bytes
SHA-256: 3598f34760e7d50bd93492030f25eb33bb0f21cc9621b13b943bc90754777455
font_02_sfnt_off00012e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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