Malicious PDF — malware analysis report

Static analysis result for SHA-256 dccf48854fc9c8b8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 06:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81c3b3a4f597fead5710165c72c3a0ea SHA-1: 01508d632fb5a9c416795ceff0743703e77ad2a8 SHA-256: dccf48854fc9c8b8c661a3fff494307cdd6d649f4778b2ac4856e35f34b255c9
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for initiating malicious actions. The file also contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://michael-dhom.com/webseiten/file/zatolubaxupoxukuxugadu.pdf
    • http://kcwoman.medsoft.kr/pds/userfiles/files/1520197599.pdf
    • http://bxbrdh.marketsearching.com/upload/files/72147687087.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b8877a4877054200b554574aa103baac/vaviturozamilenifum.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8bd4b4d95d58f66d88c78c25201686ac/6477522721.pdf
    • https://betamachinery.sa/other_files/File/daxonup.pdf
    • http://hondasushi.com/uploads/files/jusaz.pdf
    • https://batikatravels.com/userfiles/file/fuzuragenavoxafid.pdf
    • http://houstontca.org/Content/uploads/files/88803940382.pdf
    • https://cfaegaianascente.pt/portal/userfiles/files/30809252925.pdf
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/fovilupigerabisupuwo.pdf
    • http://dtjxbpzx.com/filespath/files/20210918113234.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147c6798cbc7---42315989548.pdf
    • http://gbfrjournal.org/pds/userfiles/files/vomujokamonasamojolowire.pdf
    • http://gazetavk.ru/img/file/nobakadifizebovokiwetiw.pdf
    • https://abctranslink.com/ckfinder/userfiles/files/21253199871.pdf
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/69021589070.pdf
    • http://studiozoppini.com/userfiles/files/guvilamadit.pdf
    • http://ottomaniantextile.com/userfiles/file/lukogujotuxamipuvifedi.pdf
    • http://massimosusto.eu/userfiles/files/jidunafop.pdf
    • http://www.motocams.cz/ckfinder/userfiles/files/79365622493.pdf
    • http://insuralead.com/userfiles/file/vodenaseketosajugejotegab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+sdk+directory+mac
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 16792 bytes
font_01_sfnt_off0000f3d6.bin
f809e662b9a59fa3c80e4a13b6ac16c2fed8db6601797a4868783ac489256927
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 10672 bytes
font_02_sfnt_off00010c5b.bin
853de859bfebb53a6aa325d7caf6b772d5603f7a0818fd374a6bfcb0c5d6b1fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 18376 bytes