Malicious PDF — malware analysis report

Static analysis result for SHA-256 04033d4c119aeb4f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 01:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 98c98e0e74aa523eab393b6df3bb448b SHA-1: 30a512a2cf7fe0b3e6eba0b2223f0937156f5536 SHA-256: 04033d4c119aeb4ff95d73ae85aef327a5c15a25b2614a3c3cefcd1923b2f118
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting sites, suggesting an attempt to distribute malware or phish for credentials. The presence of numerous unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://getdol.com/page_data/file/77480510420.pdf In PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ed061dba9---vazumaxefigojagopux.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/regavodiw.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e06c14e0---78926743959.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109072256479947.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/kibonisotumivoforebefeg.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109120910225251.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdae2b3460---32676168078.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/56954300914.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/kesatifovinarupemofoketu.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/59207349705.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/todifobanizux.pdfIn PDF document text
    • http://snft.ro/media/file/dunesadunufugezerewidupim.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/57441223323.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/tavazeliriju.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/21271124188.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a13b8cf09c---kafotanewepixugutes.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/96af834d1b61eedf6236d61f2b8bf586/87629278015.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d445201c5---bipalasigavaboza.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/xamab.pdfIn PDF document text
    • https://ms1oke.com/contents/files/mumaledusobi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/soseronujolabumudavol.pdfIn PDF document text
    • http://vhz.cz/user-files/wujewuko.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/galogirizovonofarigajuf.pdfIn PDF document text
    • http://capri.lt/userfiles/files/77165681192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=minecraft+apk+no+betaPDF 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_off0000c6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A2 16588 bytes
SHA-256: 8bb358f091921cb5ff11ddc3967db0ddf8d2f402c5155649b74281fa2127c497
font_01_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 10484 bytes
SHA-256: 9c2d361629989147caf14a0de615473c5540f51049d8eb32c87a6a7ff1668a5f