Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0bc506836880e6…

MALICIOUS

PDF

75.9 KB Created: 2021-09-23 10:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bd3179ec821759ece2338128bc74d742 SHA-1: c6c67044933525fe1219694c45f8014c8404bc1a SHA-256: eb0bc506836880e609d8b2dcb093a50425228707a555bb45b4bcc84e33c63ad8
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of a 'download button' lure further suggests an attempt to trick the user into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=tutuapp+lite+ios+14 PDF link annotation
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139696b9823c---tewoniwuzamobaxewumed.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/577380213.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/nilave.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f7a83a66c7bd4102e5926fba62b5fd7f/ragifuratozabogujagenutil.pdfIn PDF document text
    • http://kftchem.com/upload/files/gaxuwimawipunamuropom.pdfIn PDF document text
    • http://emaaravm.net/upload/files/nogubefazisofekegotufep.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614500ac746f0---wifoxi.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/86598379666.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/pejurofuzaw.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/dejamofigizizuxurave.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/mexazowiwesikarino.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/44164671844.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/noxaxuf.pdfIn PDF document text
    • http://oasis-travel.ro/files/puwaposigimugelefosi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/mewakowugaxuvobumof.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/nikiduxulupivuzidoweverow.pdfIn PDF document text
    • http://edeins.com/userfiles/file/divipepivaxemuxevoxuxamu.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/norexokowewoguwu.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/xujuporavidapot.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/kivototiw.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/54911204243.pdfIn PDF document text
    • https://partnermind.cz/images/files/gavizunixadukigazodoj.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/50064979719.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/zovijanemetotaro.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_off0000c73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 17024 bytes
SHA-256: a5043d47af8091f8c6469af0692fda377828c3e962540646d80be242eb3ad840
font_02_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 10236 bytes
SHA-256: f2fb949cbe60e70198a4bee26ffe440f364198e21ce4b7a76302b6944e4997ba

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