Malicious PDF — malware analysis report

Static analysis result for SHA-256 92df049163da02f5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 21:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6641ee1ba91a6c7cd4da35a9146866ba SHA-1: 9e2e1f703ea7ceacba819005c03545016d4bdb8d SHA-256: 92df049163da02f5ffa2ff0ae0154b7191ff24f24fbd62d77fd82c495163f0b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://crewmak.ru/uplcv?utm_term=stag+beetle+fun+facts PDF link annotation
    • http://gsprojekt.eu/userfiles/files/gixufadutosolipuv.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4e084c143b951d4ec50c4c11092f0cd2/50069999476.pdfIn PDF document text
    • https://xistenze.com/files/files/76035208620.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117c2738b749---gejurikujeb.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/4dc39ad28a4872733394edee1793ab11/12825080636.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/76401555863.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/jefokikasiweg.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/beraremupel.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/89869769806.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/nojosiwidirakawij.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a2abf5079db---48388016270.pdfIn PDF document text
    • https://irantruck.ir/data/file/jurugupeganajanunoxinevor.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/87837838611.pdfIn PDF document text
    • http://fohow77.ru/upload/file/41878518494.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/talojinopozezofupor.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/dfbb17a61615899c4cb34ac0f28b6e49/40777570300.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/xonomawezidifowewafipil.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/mojanipikogerosu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecdfaac976---63030910610.pdfIn PDF document text
    • http://kebirbeton.com/userfiles/file/88240648823.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/wipunofojakoweb.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/fenofidev.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a10da001ddb4478a0cd28418f96951b7/sevesufofipavuxuroz.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fc230021f3ef0c5add1dc7daeec1446/40576379815.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d20486978edce38fecf8b890ce04586d/13389098978.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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 10516 bytes
SHA-256: 74f2210b7387f8f9dce1ec562f54749a1312d85d540a213081a08e0b2723b5a2
font_01_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 17160 bytes
SHA-256: 254479e8f123209a887fa72d8cb98b0d11b4bb8b5d377294df6e543b9adc156b
font_02_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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