Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fecd9a402d38a48…

MALICIOUS

PDF

73.8 KB Created: 2021-09-08 20:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 500cb578cc3a82bfc0e1e9c6d924fa0e SHA-1: b6d98761007dd61194379b1f7aaa4861e83a1c5d SHA-256: 6fecd9a402d38a48a7973989554381015d3baa9a1fcdfdeb4709544663b69632
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, with the latter specifically flagging it as Pdf.Phishing.Trojan. Heuristic analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Some of these URLs are hosted on compromised CMS upload directories or appear to be on disposable domains, indicating a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.itidharamshala.in/images/uploads/files/7126903765.pdf In PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/lodanunibebeleromatisu.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/wafexedasenan.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/belidotaneruwinuragit.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/66960103750.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/makafirukixavapu.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/22358721798.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/15349835534.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/82777860950.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/labev.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/diwasapakexepezixevumikim.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/42337400452.pdfIn PDF document text
    • http://tercovci.cz/files/file/99786006844.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/kefavibo.pdfIn PDF document text
    • http://medi-sen.com/files/files/86324894983.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134a74ab4823---53608253650.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/mekafumowironege.pdfIn PDF document text
    • https://atrax.hr/files/48960526431.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137733266591---lixajosekamawi.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/wumifidosumuva.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/24372409184.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbc4d86f0---daxuref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=grouping+discrete+and+continuous+data+worksheetPDF 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_off0000bca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA2 16820 bytes
SHA-256: 9514a9c2ed2f6c9d2b5ea56020c5023d7c33547ef735a6736fadfc38c77cd1c0
font_01_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 11064 bytes
SHA-256: 9f78d20bbb21d9ac58953df10eb433dcb1fdfec9077e1b0c2318b908b8c66833
font_02_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1