Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1926d17fe8d3e8…

MALICIOUS

PDF

137.2 KB Created: 2021-09-16 19:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3be482b20b07d5c6d9b20c46d31baca8 SHA-1: 394f9155d99049fe970c5146457b1fdd9af80896 SHA-256: 3a1926d17fe8d3e8df4234f47438ab248243958abe5d4cc404b3a9cac5049113
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms or disposable domains. The embedded URLs are designed to lure victims, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=flash+rom+without+pc PDF link annotation
    • http://megalaserasia.com/upload///xivujemerototozozibi.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/71116643751.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/jojewubozuvepesinewef.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/dapofikikubetaxewuwelezu.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/6916248566.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/08e28f5db3bd33ef02a6de41fca521ab/pisodararirosibo.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/95477198796.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/wodixafotififizege.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/56765645739.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/fivitudowuzopamakuxa.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/20924439420.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/84j898p3b40boanc7oaqm2hcgl/rediregowimifumasixip.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/giwekomufesasogitasefep.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/nitufenewedenet.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/87396157686.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/befanufegiwixabunove.pdfIn PDF document text
    • https://marosme.ro/hirek/file/wazepetujigajewuru.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141677ef290f---dibefejamimumiwipe.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/sovikatali.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/77856105724.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/bedipovuvetegupiraxexuz.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210910/file/16312289399969.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/xosazituv.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd8ad3e62---49304256889.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_off0001b259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B259 19948 bytes
SHA-256: 81eac753d3c5c4b4025666c71b87566460ee25f1eb870a232f57fd526484e708
font_01_sfnt_off0001e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6CF 10568 bytes
SHA-256: 9cac51251562ed0c0af74cc3f6ad6872147d1fdc32b2355a39de44d2b01f9083
font_02_sfnt_off0001ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.