Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1d242d775ab3f5…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 23:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9d9008821c858a5c6048db912267c09 SHA-1: 057688b5857e50741520095522b86fbb22f60246 SHA-256: ef1d242d775ab3f5666a87fc4373c031b85a2a2d13add27c58ad97d41e50753e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://garglob.ru/uplcv?utm_term=all+app+hack+apk+download PDF link annotation
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/7949735384.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/memugolegowide.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/renizimomalupufu.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/99420541930.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///nagufedu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613889606f4cf---41284459220.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/8978985625.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/28551033486.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/p7psfr0e0qafvj8iiao29lbpu6/muvarifazizam.pdfIn PDF document text
    • https://sadex.pl/fck/file/rasusixovalus.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c090255b---fapolif.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407927ddfa3---5761318679.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161357ed2ba785---lojananumojemebopana.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/54602060154.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb2d864f8---54706330176.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/refugofelenufurunorud.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/kogiseromefovuxitivaka.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/mowagisuj.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2ba46392---67579772783.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebf4b55b0b---vofaxiwimurafinugari.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/31177858860.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613328684700f---29251780462.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/34134556073.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/sojukasupogolagiwalezutin.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///17502603458.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/60850540942.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/33601586669.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_off0000e0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 10180 bytes
SHA-256: 30bcf407767ddd84f81f8bfe8411d927e6753d728f19a1fadcb1641c65ecec35
font_02_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 17984 bytes
SHA-256: 46fcbafca233e77423a01191a22b5bce9ae4bc0e4503a7b461098abb811011a1

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