Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b06f2fb543717c0…

MALICIOUS

PDF

94.0 KB Created: 2021-08-19 22:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 30868fd6a90bced2dca80fc30db6fbe3 SHA-1: b2ef2d400cb38403e5f1a444342eab1aa480de73 SHA-256: 1b06f2fb543717c0ce905943fcc03a5cce98c30d33a56eb115132cbc5a38da7f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or a phishing campaign designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5f440bf10847664c35943eb9e0207b05/99034207480.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5e125ac9d---zejotubu.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/8195800252a1aa07443122816466ef63/foxorefelumilebelo.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4aedac6c---80893203099.pdfIn PDF document text
    • https://tappowine.com/file/21519183049.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfbec25d86---zebisobupape.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/51938014314.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/iddccknkh1dnl45rdbhm5f63us/55656959857.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/31999097794.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/nosesovazovoxum.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f5639aab1a87bad8d0e0853af999e8b9/tikuminuwonu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a228e17d7daa0ec4c87c24c29067ce48/runoburipuzokejopivujub.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/0f2ae972ceef5fc2ef824970e9a5b994/saxabavabezidulowuw.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fezerazev.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/3603b588592cdeeeab9732632475415b/xeronizale.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/18944328102.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/27117478804.pdfIn PDF document text
    • https://faprosid.com/file/jetaxijonejofufovus.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210709220652_sg5anv.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875b90f0d7f---82237579383.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/19340551233.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0d9b80a59---motapejelog.pdfIn PDF document text
    • http://sro52.ru/uploads/files/26678163945.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fq7e2dkngqb6r41iu35dc4oqtu/52921794273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=deductive+reasoning+worksheet+kutaPDF 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_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 20028 bytes
SHA-256: 45728ba27ac42acf8a2143d81a1deb8d2bfb83b0d072ed3cce2dd4eff3924884
font_02_sfnt_off00015088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15088 10948 bytes
SHA-256: 47d8a76e8f6a111a1da4dd81d86864d468df7c4e0edea7ac5855bba4a587df2a

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