Malicious PDF — malware analysis report

Static analysis result for SHA-256 20336ac2a04a59c5…

MALICIOUS

PDF

87.5 KB Created: 2021-09-12 23:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b70141c47e6db1955c5f2d45c5f24417 SHA-1: 370d6463e12ec1a7b54143e84cb31bd64887919c SHA-256: 20336ac2a04a59c5328e4a80ded0209223a85d13ed9cdc7df08ae2bdad283728
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://3bbb.fr/ckeditor/upload/files/lanorofiwuriro.pdf In PDF document text
    • http://ozdermusavirlik.net/userfiles/file/pamabimodesarojaruruvidol.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/8509a92361d3bda7f29e3670f8a1cc5a/28002630016.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/97670419602.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/ledemuzetaboti.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/tetone.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/joxudotarejam.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/60997091147.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/mowig.pdfIn PDF document text
    • https://brs.jo/userfiles/files/demorasuwavafiwen.pdfIn PDF document text
    • http://canvangdientu.com/images/file/ronifiguresa.pdfIn PDF document text
    • http://18554080.com/userfiles/file/56332365377.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5b9ebd7f---59858409999.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210906110847.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/41477486900.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/miteginonujogimuxirodim.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4vbm929fj6eji7iv8vdpm81u2m/81434102413.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/36613927929.pdfIn PDF document text
    • http://rc-modeller.se/images/file///jibabakudoxesaxisivi.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/24645011769.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210912135122.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/gegefikipisoj.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/57775582875.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/magapakim.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/megerazirevawusotawak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=all+i+wanna+do+sheryl+crow+chordsPDF 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_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 18732 bytes
SHA-256: a355efb217992e581bedd0281930301ae1aa9b18ad6d1ace48c95e82e133974a
font_01_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 10552 bytes
SHA-256: 9957e3f1e8fa5fec6f2099198ebd8e5bb59abfc5f75bbffd3d0ad2973a9ffc27
font_02_sfnt_off00013802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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