Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb72597bc030beea…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 19:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: efbc083b1804e50dbdbe3183a903917a SHA-1: 6d0ad4c782f1000bfebd73fe76b7b7dd762ebfb5 SHA-256: bb72597bc030beea1b2fc8c4626485c7becd982adcbe362c715ec97a56061564
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. These links likely serve as redirects to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=special+characters+umlaut PDF link annotation
    • http://eshop-kocicinadeje.cz/files/file/90070964925.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905710270ec---karemilosekit.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/wikewogosudokajewaferu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dekatamejefupexowozu.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/putixonedufitawizosarusu.pdfIn PDF document text
    • http://amdind.com/userfiles/file/vodomilepapi.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/rowapuxirujelex.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/jufowuwurelazanof.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/76638893941.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/jugavaloliwuboxutojup.pdfIn PDF document text
    • https://alutat.com/data/file/87781620333.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/61f6db22b353981044504f818cfae32f/dikewoguzobatutekudekesa.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/162490235434.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d94216677---35111787537.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/774f6ca06e483a7d85c4abec9a5812cc/82865895028.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8878fa6d21---bapumevisedimegojuxonet.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160fea273992c3---tukaf.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a1618a76a---50265322640.pdfIn PDF document text
    • http://wohntraumgmbh.at/fupumaguxawarise.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871e39ea0e9---76868857423.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160983c8a8a51e---bosaparejadepepilopubuxad.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/dosubat.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_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 20320 bytes
SHA-256: 180bf83fefc2ea6204da0e03b1bdb2a581479860c384a2bb9df6c3eaf7569e3e
font_02_sfnt_off00012e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4A 10588 bytes
SHA-256: 8ea7dd49fe2d81d529d2672592f151ab4bcfcc3d5e22982e59d29f5fbf0e1ab2

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