Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ea32bbe31671a3…

MALICIOUS

PDF

73.9 KB Created: 2021-06-26 21:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 137a2ca372f2bc4931a0b96ac60be644 SHA-1: 8ac8e7e1209bc5bd1eb8d95f1f921fba54dfd4c3 SHA-256: 31ea32bbe31671a328f3fd7eb99ec14af0b7ef81a782555ea8b954f26e84087d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/623e69b4c77ba99dd1f33ae9639ef32f/83935227209.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1bd4e6872---64777005155.pdf
    • http://www.bluewhaleline.com/image/upload/File/sujupuxor.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/37841188842.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/i49udcht0dmiu9vufppnieerk6/94011981662.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/scqcjokj1ac4k1mso8t456in82/vavuzukeniruratimegemik.pdf
    • https://asiarsolutions.com/userfiles/file/61393066904.pdf
    • http://omni-links.com/kotipubomojufudetalom.pdf
    • https://jetaime-shop.com/files/53687891415.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c254f90ee8f10fd618dac135747cc3e0/jivopokivas.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8fba67cf50c1797222eeea334c03add2/11212959074.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958791ab177---19029490103.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/e283ab1bfc93f90245a3baa732547e43/zeruzesirukokepabawi.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06fd15b0c---45248948138.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607175ae4c2c3---78408132453.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081a1f950a6f---5188468552.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5e2e75966---devibej.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/g5jn4k2dpqomcajfsbn1h7rtro/65297321811.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fb948a372ca77b7343105f7f628b6e98/29845739295.pdf
    • http://aldo-ins.com/userfiles/file/69328170283.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcada5a66d---zalikakuwusox.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf46a21743---kamenupidetoxabij.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/13bffc6403c8d22a217daed80be3c726/nilipivomuti.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=give+it+up+to+meaning
    • 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_off0000c192.bin
792acc25859ecf50cafe3810a2273c8d13962bfc221dec4fb0fb6650a01c4183		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC192 10488 bytes
font_01_sfnt_off0000d96f.bin
76d19ea3d98429ddfb06d8bb9991423b81ec71bc0bf3fd82b315800cf9661d0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 16128 bytes
font_02_sfnt_off00010293.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 16792 bytes

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