Malicious PDF — malware analysis report

Static analysis result for SHA-256 055837f4f96197e0…

MALICIOUS

PDF

186.7 KB Created: 2021-07-14 07:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5d37fcec4fe98b491d1b68a863e8e4bc SHA-1: 01b7580f5155f2403adc2b3675872c7593d2a5c0 SHA-256: 055837f4f96197e09bfa21858678c5bd646e4625a7446a37ab062f19679a967a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified the PDF as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2caf7777a8---gopobenumotexafas.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/222d5bb123e06d059642f5de2ed4a056/wugavasidijiso.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e5736f5a486f1c7a113857f3ee2cfcc2/77572903224.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/gixudipujilipepisizapuf.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d4e4326d0---wejukut.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/56780098302.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c061c6b6aba---8979116131.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/86fbe2428ce0c6b1e389eb6c27910637/labapeka.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff4142244---luromuzagitudidineseki.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb021718ec4---gigidatolidifi.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/pajefuxilin.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f84ef1ab5e---30597721017.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f0d66d635---nobobadifawo.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/fizunawevelagelomuk.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098280b8b0f1---38637828644.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764cd00501c---81007140149.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/21766411312.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/02r4k2j0d4b11s5smai62nfd54/judojupenot.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/11971367776.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/46a90ca5bf214ad031199bd6fc41f696/26125611920.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/31fe2116928718cb3cf348dd73641f7f/fuwilolovuve.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c5db550d6---32534627526.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/rewudiwikatu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607806d79f4f0---62050153607.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/554240beecedc4ac23e7a387e4c29f30/tuwidarojafabe.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/12245734514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=juvenile+yellow+bellied+sapsuckerPDF 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_off00027aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000292b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x292B9 19220 bytes
SHA-256: 955bcb6defc922f8f4c3d8ccd141fd1bc56af345768def99c50d9929157354ce
font_02_sfnt_off0002c38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C38C 11000 bytes
SHA-256: f33fb1e99cac0228155c66186c352b029dbfa5b26307e82228ed7d04c98c1d72