Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a39370298261df…

MALICIOUS

PDF

90.4 KB Created: 2021-08-19 23:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e3f3c7c9e05e7bb0ee3a30032a140aaf SHA-1: 4f6e445b6fa2bd15f651dff417ceb8f459611cb2 SHA-256: 36a39370298261df7cfd2eab3ecf4c7ab2ca6ef791b6160fc70bc443e0b9a321
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/tcadgo1ve2ni0nvpsaif2ptqid/61882508060.pdf In PDF document text
    • http://amandatravel.com/userfiles/file/xirevuwozarodejiwijezibu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987b41b1d10---supenokobo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2aef68390---17349958349.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/zuvitusurasu.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/rorawarinuru.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaf742609---julita.pdfIn PDF document text
    • https://togeltop.net/contents//files/16267872449.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/sutonukukodu.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/lajotir.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/50344580900.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/gawegomavufofeza.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/sidinuxawijupetuf.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0a4b122f49565bf6bd685755cb984909/44228273849.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc99939eb9---vizitafoligagulajij.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/tuxujagesufobisow.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/bexatuvusabuwemubi.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/67378014180.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/72922301411.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/60144905626.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a97adea36---23693657244.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/24942660442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ejemplos+de+textos+mal+redactados+para+corregirPDF link annotation
    • 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_off0000fc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 10968 bytes
SHA-256: f58f428dae7fcebe23191cbcd6a7fcd4779ed8a579c89feec0793237d6b9878f
font_02_sfnt_off00012dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAC 18436 bytes
SHA-256: 5ffaf45447840de169a50ee2693c117455590ec847b9380abf413f9e079a6867

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