Malicious PDF — malware analysis report

Static analysis result for SHA-256 933116c38dba8646…

MALICIOUS

PDF

73.3 KB Created: 2021-06-28 05:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87d810131a5326458b6c3e80aec8ce61 SHA-1: 6248ca4e438facea5efef7d936e7ff5b5f56ba0c SHA-256: 933116c38dba8646a2d9cbb4ffbb924768ef7f8a5e6b619a9ec70a5e49204614
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farm indicators strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724caa778aa---wamesub.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6735f3ccd6053cc6e32e15facfcd2feb/99759102948.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/25ed710901371219fa41744b648cf3f9/gofugadan.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/beusgj7o71ftaichkkuk9qcd12/28251636965.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c86181ac539---27552078616.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2df69ea4cf74a7cb6e48835605868d4f/62140854811.pdf
    • http://creatinglifeoptions.com/userfiles/files/rijepetogedumebetusaj.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe6f91af1f---13817469857.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a63fdfc7b---babuto.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/269da41e9d7c1519d215514336d102f1/tonibipojolago.pdf
    • https://itchanoi.vn/uploads/news_file/dofem.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/raguxivoviweg.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc6f7c492c---sowefiwosofafatisafu.pdf
    • https://paperland.bg/uploads/file/zefapidonul.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/t6ctf6747j6u559lbvu5firmp4/29749790289.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bb2ac89d6---sakafob.pdf
    • http://cornucopiafrederick.com/uploads/files/35494045669.pdf
    • https://wrd13.com/force/file/71091626570.pdf
    • http://secretlove.ch/ckfinder/userfiles/files/93036058858.pdf
    • http://pwr-tech.ru/userfiles/file/14202847435.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde697945e---53425779038.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a78520b96---88901108499.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/9iaete0cv85cp8lj7nd1l4qjk1/83968752298.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c55cbbd9d23---galasoluduv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=vidmate+game+download
    • 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_off0000becd.bin
cb5ca09a592ea631d5e2de8a29682fbc3b497a6f134050f968ee1782727ae09c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBECD 16156 bytes
font_01_sfnt_off0000e8bf.bin
642940fb65efdd71c459e0e3a09f68a855fae8113c232a446f04dc0e92c94cd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 10380 bytes
font_02_sfnt_off00010005.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 16792 bytes