Malicious PDF — malware analysis report

Static analysis result for SHA-256 748c5f43499b59ec…

MALICIOUS

PDF

83.8 KB Created: 2021-08-25 05:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c30dfb7c37b0de15ad1830ebf0dec9d8 SHA-1: e9632faa829802c053866833d87977a2fa948af1 SHA-256: 748c5f43499b59ec55696ee72a76871b2d775894337171df84b4970493539daa
192 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating an attempt to download and execute a secondary payload. The presence of compromised CMS upload links and a link farm on disposable hosting further supports a malicious intent, likely for phishing or malware distribution. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sten.kr/club/data/userfiles/file/20210804012628.pdf In PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/xadepudebisumobapogu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160730831dceb0---sukesosunezogow.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160898378d9ca1---91060124505.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/unl3b03rbphpf2kqvpft2i2ke3/raduwarojulifupajigow.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/11393204132.pdfPDF link annotation
    • https://pearproperties.in/userfiles/file/bumakaki.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b368ef6327c---47388786540.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/fvbgbbko89c6i1b5cj3oimnt1j/selilelasi.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/5ca6665e1ba32e917ea6c2eba56e378e/63868595219.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/loseliwu.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/setodezosebironesusaxow.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/41765184115.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/48782100739.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc8135ac0---75046736458.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/65681031095.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0822a46e6---vemunopozaleputilavokizot.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/hq778cis9q3t12s0j3m7ul10ro/25404814706.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/13743767316.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/97323922668.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/3218edff87f3a4860fbeedbf9dbaf8b5/29178814318.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/naxuvozenirikimazusu.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/50137352091.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/bolevetewewexuz.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/jonabomiwigure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mhw+into+the+frozen+wildsPDF 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_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 10428 bytes
SHA-256: 60f0b9153a535ade2ed6b36eefcabba678493d1b47633b9e50081c3a6bb4402d
font_01_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 16700 bytes
SHA-256: 29f0f42dbdc500eacc9a0d97a0202e23cbf261c68e8ce3536bcb6f22618139a4
font_02_sfnt_off000128d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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