Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7392a3806640288…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 14:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a6a3de836dc84d328b30ac6d9d51d8f SHA-1: 00f383ec4ece970cdbef344d4e732a9919a7d7b1 SHA-256: d7392a380664028899128016d82496d9b88928d868e7ff3f212fe7979c80f616
204 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document employs a social engineering lure, specifically a 'Browser Install Lure', instructing the user to install a browser extension or update. This is a common tactic to trick users into executing malicious code or downloading further payloads. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, further supports a malicious intent to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=adblock+disable+chrome PDF link annotation
    • http://szm.hu/userfiles/file/45268615675.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109090744201466.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/50601972391.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/66918596078.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/818928020.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/45031287404.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/84656736644.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/754eejfh4gi4l44u80nt6og5c7/gojemewa.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210903_7E7D78C141554D4A.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e7b830f22---58751641119.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/40880741792.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/rabejogenanodorasebavamo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161445f99a2577---tomutimuketew.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/85024979184cc311f8685340f3a63fcd/45727101478.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/37477561942.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/69139594933.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210911223035_2wkkvg.pdfIn PDF document text
    • http://cichanski.com/Upload/file/48854065732.pdfIn PDF document text
    • https://777mto.info/contents/files/24897389826.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/80792395594.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/82552633791.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/41596282121.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/risunawekiwavejakamenager.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/36005937045.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_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 10648 bytes
SHA-256: b4254181a46265d7d4274d4c7b23c68aeb0e87c4691e67e49054b45ea977125c
font_02_sfnt_off00011138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11138 18600 bytes
SHA-256: 568f748914694cc71b1caf934611b2a71d50c33410f85e3a59ec2f6713e015a1

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