Malicious PDF — malware analysis report

Static analysis result for SHA-256 02837128751ce1b0…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 23:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca5808971ae439d4918561bd9ebc6b8f SHA-1: b54f67967c2c0f3fc8918073d3982dd5938b325a SHA-256: 02837128751ce1b03203313964a20ef0f49275f6d1b04a808744591587521efe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://studioesflores.pl/obrazy/file/32393012806.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/905145d66436934467ecc2f1f5992732/87690196051.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/46hmgrdl3e4p48b71gsv8rd8em/rakebojufudixof.pdf
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/diwinijusodutivugates.pdf
    • http://31kouqiang.com/userfiles/file/1630452125.pdf
    • http://umffz21.ru/admin/ckfinder/userfiles/files/jasuvixofalotebuv.pdf
    • http://myjobcareer.net/userfiles/file/2021090422310873499.pdf
    • http://www.focitabor.hu/userfiles/file/3594070230.pdf
    • https://tumsad.org/img/editor/image/file/99059880754.pdf
    • http://abpjseah.news-read.com/upload/files/zusofemelonetem.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac013130e7---78752073843.pdf
    • http://omonetach.pl/foto/ilustracje/file/42397488836.pdf
    • http://eamenfaraz.com/cache/fck_files/file/senonakuwiwo.pdf
    • http://roomyab.ir/basefile/roomyabir/files/zobusazupezikutosokomegu.pdf
    • http://uniquehotelsolutions.com/files/others/57631520590.pdf
    • https://mkontakt.pl/dat/file/najupube.pdf
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/5691487357.pdf
    • http://sprostredkovanieuverov.sk/res/file/sivubagonemon.pdf
    • http://nessie-vinylcare.com/file/kibepoxuweliwobifafolo.pdf
    • http://thebookmarkcafe.com/uploads/files/veduwarog.pdf
    • https://shturnev.com/files/foFKED/file/48726879925.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398c61c510c---lofujoxuroliko.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=watch+end+of+watch+online+free
    • 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_off0000d540.bin
daf72a18eb5035b25e636fa8c90e4eb4a09827bce1a04a904e0573301c12e722
pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 17648 bytes
font_01_sfnt_off000102af.bin
2969e559f8c3d109c4ca031b095934cd00ba8b3ddbffdb4dd0fcc56f1b44c5ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 10484 bytes
font_02_sfnt_off00011a84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A84 16792 bytes