Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d8b15f1a16e6be…

MALICIOUS

PDF

70.4 KB Created: 2021-09-18 16:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5078b9b8e09674455bfc9af5ca141cf1 SHA-1: 11241fa1298c84f19d8ed4028864b8e34fe630fd SHA-256: f8d8b15f1a16e6bee2410b165cc726ffc481dd9eb7b302f4124e03ffe5135741
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or raw IP addresses, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection ('Pdf.Phishing.Trojan') point towards a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ooobelkom.ru/ckfinder/userfiles/files/76348137502.pdf In PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/61020465235.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nexixowuninepam.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/49466392700.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/sosuzusa.pdfPDF link annotation
    • https://sandp-engineering.com/ckfinder/userfiles/files/84646744174.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134344721a25---mizowesoko.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/29d76e76c94111c94af7ad5748895100/37195803802.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/bitologari.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/77534798349.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/3201328141.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/bawosubodezo.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/fapelokobogikoguxepax.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/83142262828.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/vekekefalutuxexuxojab.pdfIn PDF document text
    • http://elitvorota.ru/f/file/90157993012.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/mepukuj.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16144a1f4aba43---widebududojotam.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/12353318189.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/45408226348.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf339a083---54537235134.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/95496348629.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210903_8562D254043BBADF.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fifa+14+ppsspp+iso+downloadPDF 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_off0000b4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F6 15544 bytes
SHA-256: 5722d08641e312e730e90353ef85d83afb28f14f43c46eea674a6df9afc91695
font_01_sfnt_off0000dc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC51 10352 bytes
SHA-256: fc1558ad326e85666434cc76afb4cd512e300d6af5740863d0cb86c0cee4b80d
font_02_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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