Malicious PDF — malware analysis report

Static analysis result for SHA-256 39345591be715ead…

MALICIOUS

PDF

87.2 KB Created: 2021-07-14 04:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e95e2fbe4e36f615204cdfd8af403bf SHA-1: 59075f15d39851291f347b9389720aa5a78a32e0 SHA-256: 39345591be715eadfe885223a34e0785cee326e7ae6c15abbd7ff5933eb15a92
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed76fe40aa---buwirutaletetufupin.pdf In PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/39968262949.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/xajufu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ba541ed0ed0---sumokul.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/92e1610fe44cef7eb395194fea315fce/5376922867.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/luvesim.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/66897988337.pdfIn PDF document text
    • http://apvn.info/userfiles/file/38664235402.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/buxosuxatoxuvojeji.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54b0aee514---mulavavusovikajovopa.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076750f53b79---49160105970.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/zatarupinufusaxadavenojis.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/wovoz.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71e7d171d---sesagunamenawilusu.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/kapitakiwategos.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcaf7a7cb3---10123929544.pdfIn PDF document text
    • http://learningkey.org/userfiles/20988597615.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/9bb8f06511bcc386db94da239ddeeedd/lukaxuxokerixapamuva.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607195485a058---54969216300.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/segajako.pdfIn PDF document text
    • http://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/47728932686.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/gujugesofupan.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/18912471584.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/68452128041.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608752f083de7---30131137198.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dc12a75b---xoxinemedagopisojomutu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c493c78ed---sutufifavebopoloxadijin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=inflamed+colon+causesPDF 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_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 16992 bytes
SHA-256: cf06a7909ec76d03d7eb9d70a6fad8c6c174a7ffc63458f6ab078255830346e8
font_01_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 10400 bytes
SHA-256: f94a73a257c218a3493a8b6fd5c18b168931d237da1dbe9db8a6e8428287ceef
font_02_sfnt_off00013744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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