Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49ac5290915d36e…

MALICIOUS

PDF

150.0 KB Created: 2021-07-06 15:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd22164515348c2cddca8172a6ceef78 SHA-1: f3cfc7f681f1fc4c2ae2dad651c291eb1f375862 SHA-256: c49ac5290915d36e864c5aed3b48b74b3f620a65251b1aea45541ee54dc38855
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, some of which host further PDF documents. This behavior suggests an attempt to manipulate search engine rankings or distribute further malicious content, potentially leading to exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9ceb180695669360b49529d63098372e/32941704818.pdf
    • https://aurorabersinar2.com/contents//files/31344569806.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/3b71b3b7bb3c60f6a362afaffb962758/28775699311.pdf
    • http://premium-t.info/files/files/38080302904.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/bbd78e38070fbb87d3c6f3c756acbfa0/newisaxoxo.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/17df914fb9aeb39973814511acbc9f2b/50866796100.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/xuledarufusisoxazotel.pdf
    • https://protradingindia.net/userfiles/file/fofomewisavuf.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08e3433396---kedegojoxasopotapodup.pdf
    • http://kaupa.cz/userfiles/file/bukedarisenelireginatab.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b7af26bb3aa---gezun.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5ad392efc---bigawetipeluruma.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c9550137---rozopigopa.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/4pk0p0tdcvg03n4jtve4v73in7/puvewepamudozozimi.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a17e7fede49---pikajoson.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/t2umc9ec5m0lr1fjsl0gn9jnd5/fepoza.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/q5as2g50m49ihmg0o1gas708t6/1009375480.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ecb52b9cfded110d2f913460ff698ec8/53887544563.pdf
    • http://amadpich.com/userfiles/file/gorovofedo.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/kgh60ebh539bp43ut77l41p5o6/58858554232.pdf
    • http://hopkinshigh1988.com/clients/75739/File/94518391822.pdf
    • http://ytbozhuo.com/upload/file/031850324013.pdf
    • https://mvpartners.be/images/uploadedimages/file/10732045780.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=i+miss+you+poems+for+him+in+jail
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001eb85.bin
1295b2e56109f0e8223871e24fc39716876576e28ebf288bbf396c4d5ee78a12
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB85 17712 bytes
font_01_sfnt_off0002198c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2198C 16792 bytes
font_02_sfnt_off000231a3.bin
10e7002eb7462e9ea4aaa334025eeaa1e53f4777a0ab7121d799ee3a5e6e2245
pdf-font-stream PDF embedded font (sfnt) at offset 0x231A3 10820 bytes