Malicious PDF — malware analysis report

Static analysis result for SHA-256 107afc441ec2c590…

MALICIOUS

PDF

77.2 KB Created: 2021-09-11 01:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ceeabe108400a38ab6d0e3a202a812e SHA-1: a68d02561bbca0fb3dfccd52a0fe70a5a35ac9dd SHA-256: 107afc441ec2c590f3d9719eb79b886a2b0f44588cb4bd33fa1989d8c935e134
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=how+to+enable+bubbles+in+android+11 PDF link annotation
    • https://xn--psg-9lac.hu/files/files/tidiwodivesamife.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109102359416030.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613994dfb936c---3549481860.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/limev.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/nofuderoluruvatuvori.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/lemuledetawurog.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/27578759759.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/22907614990.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/1410884064.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/78729275574.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/losofasevesugesor.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/didaxavevugej.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/zofatipilud.pdfIn PDF document text
    • https://termofriz.rs/files/fogerifara.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/v0vs4lrbeuabi27vbvk7bav3fa/78105618040.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134a7e4f3ce7---parib.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/geniwesiwilod.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc9ec59cef---25845139172.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9c1debc442528d82971d8b64d881ffa5/96026443203.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/delagipoxamus.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/51802532527.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/lenovaviko.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_off0000c9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D3 10608 bytes
SHA-256: 0e779336dea457b8eab254e4ed5b9aa4eb8047d6ccb2e0732650d7f036974545
font_01_sfnt_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 17112 bytes
SHA-256: 64141cecd6ea7675ae3c11ce0e51331e551152bdb1bfe13d5ae90233ec04c421
font_02_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1