Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92d437d1129d17c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-11 17:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a37caaa5c78ce3ba72babec653f4644f SHA-1: 8d323b5b337d8dbf1df9ddba1229062f5aa0e8a9 SHA-256: a92d437d1129d17cbee550af528ed9bd2d9a63a80a8820ea22827567054eaf39
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with 'android+updater+app' in the UTM term further suggests a lure for potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=android+updater+app PDF link annotation
    • https://mimpishio2bet.com/contents/files/viluzepenonilerijofolura.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/4297203482.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/76097543140.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/99db0b5b049f5d993459e97afc749c70/67744212796.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/23348171375.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/45010766296.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/2285012274.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613594dc77b07---niniwogigagaxegenunubeb.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce5974ac2---ropinewagewedataba.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613751a6762c5---vikimili.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/77797612015.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/71735268885.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/xebulokuleg.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138eb9d5c273---46883150563.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/bibivis.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/16a0167eeea1625ff1f5dd4c379fb863/zurul.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/vobutuzaxufefimene.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/64837195874.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/kataradoxuxuwomo.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/zopemo.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/71413875445.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gumolaka.pdfIn PDF document text
    • http://skupka23.ru/upload/m/lakiputemo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d807eed7b92d73389970444cc5cd1ab3/49262704194.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/zokodukal.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_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 17932 bytes
SHA-256: 93939e82c0f80215133865dd6bb867edec60ced2cfc06b5db170a478e644f6dd
font_02_sfnt_off00012ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 10252 bytes
SHA-256: ce7097f2b0b2cff696dbe740257d8f20c3072fdf92566a6e06c1a4fe6314a812

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