Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4dad67db77daeb…

MALICIOUS

PDF

85.0 KB Created: 2021-06-30 22:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13808d2e628cba476cc0508749893d8e SHA-1: 400e4697b8bd6fb644cfdc877c2ef542ea5b5606 SHA-256: dd4dad67db77daebbebab24eb02eff9bc8f84e6f1cefe8b73901471f5cb62992
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or to distribute further malware. The presence of numerous links to potentially compromised CMS upload directories reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://a2designbg.com/userfiles/file/88339922882.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a38111a5744---38200418375.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b101f8a7b2b---72306057539.pdf
    • http://micronforgacsolo.hu/UserFiles/file/tinamajiwar.pdf
    • http://fapannimario.it/userfiles/files/jupilitaligujagabibubigas.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/3b675816955832aa028f4aa667c9949f/xawamokuxonokanugufofe.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc2eb62e0---roware.pdf
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/68639269089.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa550879ce---dagolebavarorowelusa.pdf
    • https://anthonygillant.com/userfiles/file/49099842616.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/713a8f617e690dd3c625420dbaadd58a/zulunovemotarujeruvaliz.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/98805524415.pdf
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/vusaxeki.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b49f11e8164---kisepazixibojofilisuj.pdf
    • https://aslimitada.com/userfiles/file/xowedexatelexivi.pdf
    • https://tourgardan.com/basefile/tourgardancom/files/faxusoniropalokigatezi.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ee637e0f416b93d4098ea537a3246864/6018929687.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609888cd5cd0c---46705124236.pdf
    • http://dongshengcable.com/images/upload/File/nawedejulixo.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/5htt6dgn60jkaaaqo81hi4fnd9/10673792568.pdf
    • http://hakkabrothers.com/userfiles/file///16678223087.pdf
    • http://doo-san.com/userfiles/file/20210525135456.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+change+product+color+in+photoshop
    • 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_off0000e955.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 16792 bytes
font_01_sfnt_off00010167.bin
8cbed49fb9aa6fddb791f3cdf667db07fb7b1a78dd1719899eb83d9f58ded114
pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 16924 bytes
font_02_sfnt_off00012d86.bin
34b93a1ba424d3b200233215b7654735c8b92e064bcab5aef5f4fa5746e706c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D86 10968 bytes