Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa4a909c5dc964a…

MALICIOUS

PDF

97.4 KB Created: 2021-07-14 00:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8906b95b6db1939fd2ed7ede2a252da SHA-1: dc2226351df3545b6ec61b983d910e9782f9536e SHA-256: eaa4a909c5dc964a8ea6b47e75801135998686385ed6114d8815f14ba600213a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, many of which host other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9421

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 https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qgsjnjcig0r9aeq3ppt3skh411/16827467252.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4536971d0---58924863147.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ip67jin7iromjab8jl968835g1/gujepezigeduvabol.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd82648dc---lozexovujemikedudasog.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/48b55d13fee07a77e4cc08a538f7dafe/famorubawabivijotumiju.pdf
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/jexixozesalo.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/nhcpbplvdiukd1ukjjhtgqndh2/zerigo.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9m20tkcvd9sfn8pvfnhjsaqo21/gepozotowewujoteletiniwof.pdf
    • http://music-summer-courses.eu/upload/files/nutevirikafulejes.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb586ae10f---bidarosoxemi.pdf
    • http://poltinka.ru/userfiles/file/38763773245.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce151a2341---valewijiw.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/7a1e15789d13ba60dfdd823dac45364c/sidovoxezoje.pdf
    • https://aashianarealty.com/file/5625639854.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/b9397ae0fa432e9ad2b33a65b6fa2975/8597584373.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b04edd4ac74---29558794384.pdf
    • http://daonshop.com/files/fckeditor/file/lexop.pdf
    • http://laweasy.kr/userfiles/file/xuxatula.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a00935db8d8---33162188953.pdf
    • http://www.awakohchang.com/image/upload/File/utipigudi.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe0ca359b---direzuxiduvegijomoxiweg.pdf
    • http://innova-perila.ru/upload/files/timejabimokobajetosilaben.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078757c49d60---61467999704.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/sskkdv26a6l1b6vghsio1fisub/73676217661.pdf
    • https://lasanisports.com/files/72690184843.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/jvdv37hrs9nh0bcbs7pg8acabf/jepuxezuwadewudakevavum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=string+substring+swift
    • 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_off0000f85e.bin
41b36f34e021afb90f04a384fdce9b4058a1f6a49566b85483b6e33df3110270		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 17404 bytes
font_01_sfnt_off00012618.bin
4ef7ebe9ddd77f9418a0937461b1c87a9bcc9281a391b45278b4342e623b209b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12618 10328 bytes
font_02_sfnt_off00013d80.bin
5fd59f1ad67d52b6a009423c7f224673e89dd1d0640bd2e9a7ca0adf8beaf021		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D80 2468 bytes
font_03_sfnt_off0001484b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1484B 16792 bytes
font_04_sfnt_off0001605c.bin
9482749e3fd5105bd0f21d68d186f6ddb92666427797bfe9ae87b2e6cb8e40fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1605C 16500 bytes

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