Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f04ce56b33ebd9…

MALICIOUS

PDF

104.0 KB Created: 2021-06-28 09:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fdf751c29e7df5eaf742fdbd1c17e12 SHA-1: fff7366002248e0dcf5071a7fb2b88b62656a2af SHA-256: f3f04ce56b33ebd9255747682d2f8442b9df12eb45f0bdffebda99b556077fd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://samuiluxurytravel.com/Uploads/file/lupitaratemezesetug.pdf
    • https://maxflowfans.com/userfiles/file/13860212151.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160aeacd8bb6fe---zijaxejagekoje.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/oium8r3vggftjho2jivkk1smk3/muvatupawepodap.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/18251fa07f0015e1fee59e2c75456878/8020131782.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/0rhglggjjjifnirq12hqur83d4/xovugefitijivekufelekuf.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/15912806805.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53eb64d183---41374176487.pdf
    • http://medi-sen.com/files/files/52150691268.pdf
    • https://bandai-k.com/userfiles/file/tobokirave.pdf
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/vojazoni.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160945aa31ff5a---fuxaviwu.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfec4aff7d---puseriso.pdf
    • http://aarogyamedico.com/userfiles/file/59252313129.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebb4b802c1---46515928986.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e4c2b32a---pugoxegirodabezumage.pdf
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/51495661370.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48f819fb29---1836585100.pdf
    • https://handientu.vn/userfiles/file/88422493817.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c2353516310172f1ab93657a8faeaf18/makubudiwoxobafa.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878575503f4---gugefof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+hobbit+azog+the+defiler
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6afdd4e9---18556168913.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107dc.bin
6c26203ed575f682af608bbf7d3d820d247c04cd8d6317b72124635a75117617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 17020 bytes
font_01_sfnt_off000120f3.bin
516ccc6fd115022df1f645de4e94a84293eb20ae887c427481a111d32c334fa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 2656 bytes
font_02_sfnt_off00012c60.bin
c5a54b7f6fe4a1fa231890d2d71420af83144f890e1abeccf1447f9ed0807f1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C60 20000 bytes
font_03_sfnt_off00016027.bin
a7363f7745f052c068eb00761913b4a094dfe49a21d46a947145e004829dfd1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16027 10524 bytes
font_04_sfnt_off0001780b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1780B 16792 bytes

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