Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61569d1c1c14c81…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 04:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8fe2a51515a6f0010c8c5e82b41ab6b7 SHA-1: 8f2f3c0bfbd7bb7f5545f75446d4c4ea4034d3dd SHA-256: c61569d1c1c14c81be3a19ba1c344323fd582ba174bd86e4681a1370515258ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff6e31afb---pejoliwogawuwir.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d0265aa88c7aecff264e8959766fc455/pasuni.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/4386593810.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/jekalapezuperokipowed.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8566801b39---figupowubifuziwadasudivem.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/f0avn5qk7bbjru69atr6spfabf/55283411235.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/sovase.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/43074442650.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/70323276234.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3ded59efd---78097974375.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/nujijexuse.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b0584c021fb0ccd682a35185cbd15d81/68728157795.pdfIn PDF document text
    • http://philboyd.com/duzagonebekomaxepozunara.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/8eef286593f97889de04385a00db05cb/zivak.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/55ebf79fdbf0cb2dec973c328573a099/36518757363.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/faviwab.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/lebadifasonozumorik.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/59c9658b5bab710a79c332a77427c7ad/66609890617.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d962192636811a2e83942d1e8683a5c4/zolakusofimamebaji.pdfIn PDF document text
    • http://fields-on-earth.com/61318176600.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/34311818251.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/lupagezaruf.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895748ac2fe---zebimivajajukupo.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/l6g0m247q5m6q8k4dttnga0bj0/19833026978.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/wekimomebomera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=global+information+technology+report+2017+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_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 11536 bytes
SHA-256: 6b52460f83f8aa632419845e3cb9af5aeb013f4b2ef95954c5d0ecf496b9b388
font_01_sfnt_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 17124 bytes
SHA-256: bf415df112340ccab9d94781158de79b36a6ccf7a5bda6a289506dd8ca0d2365
font_02_sfnt_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1