Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d48c722c9f1a1a…

MALICIOUS

PDF

86.5 KB Created: 2021-08-14 07:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 62b4ec87abd31cd1d17a6f22f4532e57 SHA-1: 961bcb2998912baef0d419708edf07ed8041f2dc SHA-256: 89d48c722c9f1a1a580d822e7fc3055306fd522621f7afe367498126f703098b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://home-hj.com/up_photo/file/zujanarasoganogala.pdf In PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/66939446407.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160776803873b2---46924165489.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/qkqcb2855qg867c6haussk8sd3/rexanamemezelep.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/97361732178.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/64972743996.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28931235490.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a5da638c8b50b81e18cf5fe17c597143/razewusila.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/gemejaji.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/f47eedfd303ccb3834555621cd01dbd9/234544584.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/45323345701.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/gq0s8oj05sddi033rhqkmrvks7/sekonoror.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160806b1b06e4c---nogagirivofeweba.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bea9cac8f4f---17807075486.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8a1cfd5de5c8f5d5251fedb9624d8be4/rilazivegesuguvabagir.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/78735639120.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5aac213b2dafec8579a75997098d6e50/16270898181.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/73753336249.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608557e09145c---fupuvufedoniripuvefudeni.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837dc879b89---niroja.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/tixaxosevaxo.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/radurepapolivivu.pdfIn PDF document text
    • http://bristolvietnam.com/upload/ck/files/tomoma.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/xikitekorelanubup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+set+limits+on+centurion+gate+motorPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 16484 bytes
SHA-256: afe315e2ee60f20293f08670fe72369990f9b542779726038513cf7661014eb2
font_01_sfnt_off00011acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E2 10748 bytes
SHA-256: 5cfc8191c7c43c7255df3c0bf6f5b8b7b12b11c83cc12847c47ba71ddd68ece7