Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a19554720226e1…

MALICIOUS

PDF

85.5 KB Created: 2021-07-02 21:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 485d6a815621499443801ad46a3052c8 SHA-1: 5ec792f4c2c4691c5cecb032d4b08aea08dd0ac7 SHA-256: c8a19554720226e1b6cff4b83bb332a6818028b0dca504acda1b1929f3c51843
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to external sites, some hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cathugo.de/res/wysiwyg/file/54101236809.pdf
    • http://rayanchem.com/d/files/27769067447.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7934f01d303d5b99d420a7b54c837561/ninifomux.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/07d128fb68e2f9962f5a8a85afc0f411/29956509863.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/l1t72b5g2ai5l32i6e862e74mk/18579921499.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/du1ock19issekipohe2uam3u6d/79758567934.pdf
    • https://alshamiltrading.com/alshamilfiles/file/98908808025.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957a2a04e74---2852653359.pdf
    • http://iaestedresden.de/userfiles/file/94606733045.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/62dc321429dd93a336ce2a73fc6fbc5e/siramifezamisud.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2550300c68---79768865002.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0b22bc9a---jatadap.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce59afa38a9---zelojavoworemonulexigerus.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/73i77pcneebqg0lck32b412k6c/34126581156.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dde8803aba---17200963942.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/56656e29a8958c7ea5606e3992f61dc0/43586619057.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11327bebe2---93524524837.pdf
    • http://abacusnancy.com/userfiles/file/zuroketelisake.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffdd850031---40183446974.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4a0e3156d09b0cea21ff893dfe67b27c/91261956522.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/481b852b84d8c8408385e03ce0864978/83103436502.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/bf9ec199f7b2e821f9d87e6c1bacc0b4/xatanenewapoximad.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c965b78ab---vivilafovog.pdf
    • http://biomisszio.hu/tmp/zenexamifurafuzebonud.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=red+comet+rooster
    • 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_off0000ef71.bin
2f710ebb39844ef75c460f74ad3dfefeffa62d7a2b9084b40f2bdf460b6585cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 16588 bytes
font_01_sfnt_off000119fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 16792 bytes
font_02_sfnt_off00013211.bin
eff22bb9193090cf84d223448a0303583a7884f6658fa3213bbdbfd1d8861cb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13211 10172 bytes

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