Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b818bc26c6932a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 18:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd5ade8880b2349e7adc77835663fb16 SHA-1: ba5911e2ed3a383c8987584495205796646e6346 SHA-256: 06b818bc26c6932ab48e6a718f400084e8fbb7d1e08a9296d056043ac74a568e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript could be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847c7d886a---kexajabipirulopad.pdf In PDF document text
    • http://anquocrealty.com/uploads/image/files/99626599046.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/94382310439.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/waxapujujixurariretetadog.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9ffbf0e424907030f8b46c330f65bca9/78813889191.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/vanobeferuxusemigak.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/66898068840.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/lerumova.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840583caee2---xuwajuxa.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/guvedajedokijowafe.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/635834272.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/80949767644.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/fusamalowumefidulu.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/50018456513.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/67624930470.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b1ff5b797---654483302.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b32e668ebbc---58807923889.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/gidogufozax.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/melepijadusu.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/zukaxalu.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/37647533418.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/78f6624ecf84edc1af15bfdff85bce9a/sadinotiriruxirobuwatu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607034bb12a12---gogudid.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/af7dacec178d0414a1789b57a9bd4138/65990396560.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/wategugisomadovitoxemukud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+hiit+workout+movesPDF 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_off0000d59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59A 17036 bytes
SHA-256: 5c9daa89c684fdc6cbbc78b8a2f5a5212db6429a8642027fa2d8a4481ff5e11a
font_01_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 10456 bytes
SHA-256: 038b712fa868e02c50313ecad828562072eb30a418df054583b46f41970e26d6
font_02_sfnt_off00011986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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