Malicious PDF — malware analysis report

Static analysis result for SHA-256 16918b860a60da77…

MALICIOUS

PDF

85.7 KB Created: 2021-07-01 19:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a9c49b5da011348650f452c53362f286 SHA-1: c7b73625d16774c2958f6e2a7d6cac0cb68887b3 SHA-256: 16918b860a60da774b5feb51e21fedc35738eed98f3223bf9ffafe2c2cb2453b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The presence of JavaScript suggests an attempt to execute malicious code, likely to facilitate further exploitation or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/dul6u36chdmuc9r5el78ojuq84/depolar.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2c1fae63d---81889448548.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/49983045829.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/65455780707.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20e10c4317---64475193844.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/5208065100.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090026b0c18e---91224410111.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/wazesogazofa.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a433e509ce8026908dcd3c284629585e/78520089940.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ka70b82gsnsjt77be8cov4igks/rusefarox.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6cfbf1861870fcaa60a6aa752480332d/75455598842.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe4cc9faf---wulufaxo.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ede9856e5---79506002388.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5a4c2d67ffdcd01f2f7d5e4e1928fae5/32978034101.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607628f0322c9---zinalozik.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160883a0456013---15822824085.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-17/20210517035043849375.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bb11181ea1f---28246365138.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/xufadub.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/75553778482.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3e1aa8664---73760164061.pdfIn PDF document text
    • http://web68s.com/upload/files/53967558822.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/21bea40ebca5ad791c164ce50c4839b3/27131985505.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/muvadunemesigixiwamawabod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+does+mic+monitoring+do+on+xbox+onePDF 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_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 16936 bytes
SHA-256: 60e2e5e6ef2d0499d8e614cb1099b1ea5f343ce05b3fd6faf958e905134bf7db
font_01_sfnt_off0001181f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181F 11008 bytes
SHA-256: 5f92cb01565cc3ce8b1d7382bd9a5c1238c168083522ccfcc28a0dd557591381
font_02_sfnt_off00013159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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