Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f177dcb521e03b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-22 20:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 772ad473d6a6ed8f5477fb8be29677d4 SHA-1: fe18537aa706e67a689fb4590ae89c9f111e4bc6 SHA-256: e7f177dcb521e03bf9cb68566995b4bf7a7187fd790c4e369a444a4461903025
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple disposable hosting domains, suggesting an attempt to distribute malware or phish for credentials. The presence of external URIs and a link farm on compromised CMS upload storage indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://arsvet.ru/img/upload/49711778674.pdf In PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/3e7c99e18e470b26250a92a7c438fd21/vorukawogekiku.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/penizogidosapunodosid.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/vewafunipekuze.pdfIn PDF document text
    • https://hgb.se/filer/file/64981738361.pdfIn PDF document text
    • https://wrd13.com/force/file/78481893355.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/75801956228.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/78175132571.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/11264053730.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/terinopexunenewaxesuv.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/loluxuxenuw.pdfIn PDF document text
    • http://kesifveotesi.com/files/97555651504.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/guxotuxep.pdfIn PDF document text
    • http://strahyi.ru/images/file/lujirunovedozutifakajova.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a44c6a67fd3d51eb34a97f4ed140fe9e/77994967561.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///meboberi.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/gulisakapobolowufadira.pdfIn PDF document text
    • http://air-ned.com/uploads/files/jujifamowafobujatoxenu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427b19c3828---65797236375.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/momufomefegolezajuvudov.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/makomafotakotikusiterer.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/78317495648.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/89200292577.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b38be7549d---74243355004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tubidy+music+download+for+androidPDF 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_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 10812 bytes
SHA-256: 6b75884960cb16ecefd27a4ea38c0f476e5e11c82a968a525bf621bfc4e5160f
font_02_sfnt_off00011842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 17416 bytes
SHA-256: a8718b3f1e6a91a970d81e511ecafd4b0e3f21392838e19ecdbf89663d5092ed