Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a38c2b08eb2ccb…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 01:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f807a44121ebec5416120e8268349af9 SHA-1: 4f835bdecd088378e5dc2e1e4708981b1795bafb SHA-256: 15a38c2b08eb2ccb436d7b95bf751aab31d814a7085b6bd990f48494eb665f1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains a large number of external URIs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=hfss+user+guide PDF link annotation
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/jebozigomibetesonadi.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/dizawug.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/81360276247.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8b731523e93f43298ddb75bcb6fd2b09/pugijobatawev.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/61349864534.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///17111098170.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/kejalobu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/68hern0ba4mt2c650aacj5pj47/loxomuwixavajupifukoki.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/40049732101.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7nssimlfnclesh0sjs0jqc2i64/61381522709.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb9fec622a---siralupenixevovizinof.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/28e3c41691955c2e49b6611bf5ea838d/85962807702.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/pobalipajagev.pdfIn PDF document text
    • http://kunbot.com/upload/files/turagozuzamib.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c52c0e74531---bikimomuzopi.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/c825f91b12991eb542f607e277504fa1/3837244870.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/p7ppv9a0rglh1rgl5knp7fvpq0/25354824792.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/gajakuneki.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/34303625058.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/b1668781b31cdd174bd66eab54e7ac9a/18104941362.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/k2utrt8eh8fnnusm2lpgj00lbp/nurenebozujobekibu.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/47332878996.pdfIn PDF document text
    • 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_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 18312 bytes
SHA-256: bfb7c70c693de8fa4d41e4e195b506e8d5047b1b00c3f5e10b8f53f474cabeda
font_01_sfnt_off00010fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FED 10088 bytes
SHA-256: fea3157fde1ee58ac99b4a281168d2d1bbd333633f4308f4ee2a2443d1fc373d
font_02_sfnt_off00012644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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