Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b184319de1aa6b…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 20:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e89965e126641fa68325fed041d3c81c SHA-1: a84f2571f09c529a8985667e8376a02319c5a9bb SHA-256: 87b184319de1aa6b8410b7221a123368bde906edc9e5bbdac05823ae217007cf
184 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and presents a visual lure, mimicking a screenshot to trick users into clicking malicious links. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, indicate a phishing campaign aiming to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crysiq.ru/uplcv?utm_term=get+over+it+full+movie PDF link annotation
    • http://lngpetro.com/userfiles/file/xewulenisekemobekelatefox.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/nuxixarumesupuda.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/kitafivorakojepevamekodu.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/15376629885.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142726a792a2---ragetamuzekof.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47aec08e2---nixuwijelurototilalok.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/nukez.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/95369764285.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/vuposuwikozilubadafabir.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/78786432963.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/80368990254.pdfIn PDF document text
    • http://ladna.pl/user_images/file/52184702300.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/8957247229.pdfIn PDF document text
    • http://dongphat.net/upload/files/vatomigefavisuj.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/zenitemadawuxejuweroreki.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/640524878.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210915142913.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109070428017775.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/xopune.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/51897282873.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140059b65f86---29146181627.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210926073739.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12678767352.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_off0000b1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AB 10144 bytes
SHA-256: 3e967dce9857e9079bf293e6c8a4aa42ad2cbf34709e39c999e7cbb7ae4a1527
font_01_sfnt_off0000c865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC865 14316 bytes
SHA-256: b0f13ef69e8e260eff437dbbfae332f38e9d3ea4565d8e14227281d37eda5772
font_02_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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