Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56d2765b8d6a420…

MALICIOUS

PDF

69.6 KB Created: 2021-11-11 20:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8dae4b3d2e37dd23a4a4b36a06e5d5ac SHA-1: a615106cfdc53b527351e061692a34ae030d29e5 SHA-256: d56d2765b8d6a4201ca64af7ab6db9a7c8910d1bab222c77f08a20fcc4adaef9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=elements+of+drama+powerpoint PDF link annotation
    • http://massimobertoarchitetto.com/userfiles/files/xidokosewefatizidigik.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/xafafexotatatotez.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/73543993729.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/83256785105.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/dewufemugu.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/fopixavemukirokasivatiwaw.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/busulake.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/benoseb.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/22313770649.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617002ef00d8f---judogusu.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/71168923803.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210922_145427.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/70678337127.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/wixigesijexu.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/76697252216.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16165487165a96---35335639989.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/resunumavubuwusunenus.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/tonifidomimuzivixivamub.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fecbdaabaf---55033070757.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/31427741358.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/fadufunitale.pdfIn PDF document text
    • https://ka-base.no/images_content/file/felarixujep.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_off0000ac03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC03 10728 bytes
SHA-256: 9723c10b9a7174e8370fe7c439d8eee87ee36c9062628b1549c27c74b323fe78
font_01_sfnt_off0000c4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A8 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 17444 bytes
SHA-256: 9092adc35032361dcd75c8c5109328c788360cda3071c5fc227cafccf8931e7f