Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa23197cd5b5c88…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 16:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8b943482bf2d73b042442040b565cfd SHA-1: 2f4482e0a813521bcd8c1d4aebedbfb5e3e52928 SHA-256: baa23197cd5b5c88d88f2d514317ab5824447fcbe116809ad94c11d6ee37cdd8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to external resources, some of which are hosted on compromised WordPress upload directories. The presence of a 'LOLBin token sequence' suggests potential exploitation or obfuscation techniques within the document's structure. While no scripts were explicitly extracted, the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/01ac6d9a6d6fb24cf082718151d8a6c4/64559562427.pdf In PDF document text
    • http://aybar-gallery.com/userfiles/files/zelufilalaxikekafifo.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad745738f0f---12792569877.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/58c1feae582e072ff0382815b1bbe5b1/woratajixulajedus.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210828164507_0wkva7.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/54885384143.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/19367413773.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ebd7b3e356d8ffc91366ea9adac4ac96/45315608883.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ncnk0fv2883que3pp6jjshdtu6/poribowexikexex.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d1dd3ad1e---3929598072.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/01vn9hfn09q9kddeuolqlfm1lq/simekifatoxiboxupite.pdfIn PDF document text
    • http://megalaserasia.com/upload///84813335631.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/61479250024.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/25707614074.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/26846407291.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/wabow.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/ketojusebanav.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/vetojaketiloxerufotuvi.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/32864842693.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/megapobizibilitude.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/1407034d7fed25efce856e81fc2f16c4/mufogoxijowoniwarakofa.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/22299844535.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b584cf678---13446246786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=puttin+on+the+ritz+free+sheet+music+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/50e160c7507880379b98ad09f6c4bd46/61856699844.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_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 10840 bytes
SHA-256: f23eac03960b60a513168c923bacd2553bb81c52b5e5bf569fe32e5539dddccc
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 18536 bytes
SHA-256: 22ffa084c5b315663645b27f06145cca5270c3690d0c299b0e188c2bb959ed38
font_02_sfnt_off00012d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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