Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de634f187e2bfcc…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 21:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 608b3197798649cc31840b0cec0ddf0b SHA-1: 8f9bc304a5ee3dacdd2129852ea8e13dfcb0ed7e SHA-256: 3de634f187e2bfcc2726b06fbc81a8b7b80e9893fdf308fc345df61d25e6dd71
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many hosted on compromised CMS upload directories or disposable domains, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ludifrance.fr/userfiles/file/62734461418.pdf In PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/dodiwigukemudov.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b42f440b271---fasifowanogosapogisedi.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/kuludob.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/suzivakumixonipeloku.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/9980461213.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/95399614860.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16114b331c3fb2---82505973764.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd78aee92e---25328971579.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/vofuxotozusininujizi.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b1e7a5c0f---xivorobuweru.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b833839263---75493928315.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/28721903543.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/98375557757.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/pibiteziwepesewutedewavu.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eda90522b---91415446813.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/35706295977.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a08c84f506ef577f51ae0fe1ef49a624/wezelanufilufo.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/293aa45fb9561ffcabed7ae5917cb82f/budun.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/5605870297.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/tigilikinet.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/5173781186.pdfIn PDF document text
    • https://estoniapools.com/contents/files/39726255900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=landforms+created+by+volcanoesPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/kimabebulidekibanomutaxa.pdfIn PDF document text
    • https://medlineplus.gov/volcanoes.htmlIn 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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 17452 bytes
SHA-256: f3e061d338a5c1a56b5a5ffa90cc483bfe09d36eab77a6f7aca332470e99570c
font_02_sfnt_off00012a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7E 10824 bytes
SHA-256: b64c5421dd670c9202d637e6f1199a33cbde346c70dfec45427df7055ab0395a