Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c558495aed0d37…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 22:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 955c1fabec0e53127c1ab7ffa62fffee SHA-1: 9c012da8af53524f3b2e789239cef8f511242ed8 SHA-256: b6c558495aed0d376c92ce338d7f4194e551fa8657afcdfce8cb723ab3821621
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://myparrotfood.com/user_files/files/66467039326.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092161b2809d---binel.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/onodotabozukobukogepatu.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/68986884819.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/15913143875.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/20580102805.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/lovuma.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/vemog.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/kuwepoxutemonemuni.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/11875886805.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/52698747858.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/dezamibujatefolejorese.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/bipabovirixik.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/petabajeludedifu.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/8557890376.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/nusevenikumeba.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c405f9390dc---zarerolijomonapapabofe.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/setujodededunizojiju.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160be503caaa06---27364850436.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/9omb7amgvnljd191kj0u9n8s8p/bojekimutogomafebifozito.pdfIn PDF document text
    • https://area5srl.it/file/30092256703.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/fm4j1unngg2jb7f6ols3pl9b7b/gopivixumar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=samana+pada+list+pdfPDF 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_off0000c9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 20184 bytes
SHA-256: be71456f91fdd18624223bb21f2f87d39a74fbe7d17cc51610945ef8d0846d60
font_02_sfnt_off00011731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11731 10380 bytes
SHA-256: e83c25c66ba2d1ecee4c640f68b6533992d7c4ec082c99d904e09c724039dbd8