Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d1b5643ec417b3…

MALICIOUS

PDF

99.3 KB Created: 2021-08-04 01:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13537675eb5119dd6babc1fcbef566e5 SHA-1: cd718dd635b5087c6e4f6eb503bf5d30f3213740 SHA-256: c7d1b5643ec417b397d37b5a1900c039782d038851322f6f7e454674673859c5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites or use disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. The presence of external URI heuristics and the link farm structure suggest an attempt to exploit user trust via a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p3kohep2ff99f312rt2vejc67s/ninuvesivavulofival.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081809c7b850---wetiwolimife.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8260aec45---lemomegiremutevubexujibi.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aac09b61fb8---8928201074.pdfIn PDF document text
    • http://castel.lu/userfiles/files/85964001697.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/gutagefapavapirisexu.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/72438184067.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/40s79uqh00nf9mk0c6unesoinf/funomumowetakefumavi.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/fubukimuligoguwisifer.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0dd6d9d82---81281844800.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/9ae119f034c0e40fe6e47045dd5b86c1/detusazoki.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083703b0be64---kususiberurerew.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/498fc137c73dff20e05aa3a2e2237ef4/jekutatolegovagem.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160714e5b410a7---renakuvavitavokifixibo.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/43038650534.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/86940390703.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105310946072906.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/5747f6d10af21eb7090427f9fb8f3647/65106424052.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/9nnhei2m74tdtrvvnnsj88lni4/tudapoxatufibarekadaxu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1908f7342e---15330573732.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609284f0b8ec1---66157918024.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/70385839444.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/xezova.pdfIn PDF document text
    • http://emeat.ru/var/files/41375391941.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/547198148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+breed+best+dragons+in+dragon+mania+legendsPDF 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_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3E 10808 bytes
SHA-256: 88978986e34db3937b4c68bea1f3fdba354ef1fcee9290ec7811476d736a6891
font_02_sfnt_off000152e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E8 16896 bytes
SHA-256: 0c403a896af792b204b4e2e77503fd78fd99da632e9dabcc13026f0af4284a70

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