Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b749be804cd57a…

MALICIOUS

PDF

88.9 KB Created: 2021-09-19 20:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b9fe2c7db1cb9b2bd6888df851d11a3 SHA-1: f4b2832ca7fd77b8a01fceab47fe94e094f2520e SHA-256: 16b749be804cd57a7afc605c2f00465ee3beeeb13d36a460edbe24db152c9197
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, though not fully detailed, is a common vector for exploiting PDF vulnerabilities or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=samsung+galaxy+s21+ultra+5g+vs+apple+iphone+12+pro+max PDF link annotation
    • https://alakharia.com/public_html/userfiles/file/kegememubafogakajo.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/nabuwogukewagedawawut.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/76517153123.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/84169126223.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/pifukabinofevozeju.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/woruvosegapedigotupis.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/vumomijipivupuvuvali.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332bc3584d8---13524825003.pdfIn PDF document text
    • http://redactron.com/userfiles/file/vokirufubegav.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/jebakedaladunuvibopekit.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ofcmqvf87ropeskfpdge9vjnsn/gejojakuboziwemalobub.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138905fc8690---15007106825.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210913_6CF3DB27984572DD.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/26983786168.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/59592966196.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/vefizova.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/86429795203.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210908232632.pdfIn PDF document text
    • https://membermimpi.com/contents/files/nixawoj.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/791249812.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc682c22ef---bisobifokimikuz.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/6417214101.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/14344923510.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/kufat.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_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 16712 bytes
SHA-256: 37b10b54d9557da97cf397ccfa1b1c31056f2d77c483de3f63750c6e0ebd3d9e
font_01_sfnt_off000121fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FD 11460 bytes
SHA-256: 9b33daeb4fb210300dd590c95e87ce60e14839e2ef5f62d8eff8e42a90c2cd86
font_02_sfnt_off00013d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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