Malicious PDF — malware analysis report

Static analysis result for SHA-256 d620cb88444498cb…

MALICIOUS

PDF

101.9 KB Created: 2021-09-02 05:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a72e2ccc22935e625d06a668d3939b4 SHA-1: 0a97d0011fe4e5308aaee92b6395b55ff22c01aa SHA-256: d620cb88444498cbc2a1c693fd314d708c70545d24680afc6ee9a5360b995d90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm and was identified as malicious by a machine learning classifier and ClamAV. The links point to various domains, some of which appear to be compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=benefits+of+technology+in+the+art+classroom PDF link annotation
    • http://shinies.ru/img/lib/file/52721452757.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061713562858.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087474a326f9---34542347513.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/95037446470.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/48206390413.pdfIn PDF document text
    • https://33mobility.net/uploads/files/futinukavoli.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/93336018630.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bef58523c50---girutavanadetoxozaturowo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bae8aabc---nagosawagolepoporato.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/devasegebikexiva.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/pq9jui45gjcheldc100ibql6sa/jefonade.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/54967705305.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/813d3534d4d5f4966d14d7e175ef03b7/jizugerab.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/0030eac7a614df66ac652315e02b035a/81162269719.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/datoniweluxaterutitexido.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/xozelewakuzoruj.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/toxejawerekiputexukozizog.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/79969128168.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/besola.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/32194740116.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/wipakesoxufuvidisedaledo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcf9783af9---81828261645.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/5u7iv3ofn0l7mqo44mdeq9okr1/monudilunonobobol.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_off00012917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001412e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412E 10952 bytes
SHA-256: 7dad3e55733dd9b36e9c41ae2e9eabad62fef1e702029895122add32735cf8cd
font_02_sfnt_off00015a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A73 17820 bytes
SHA-256: effbbbf5fcc8a70b071921e8ad4d818022c222effa20bb1adf138ad255afa6ab

Open this report in the interactive analyzer, or submit your own file for analysis.