Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d7ec0444eacfb6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 05:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d3fc20468cfc6d18fb0af00c477ffeed SHA-1: feb11d7157584affb7843ad19aab7b0d02b4ed69 SHA-256: 57d7ec0444eacfb6632f1ec14dad8062b002881eaffd133bf8bee0ad569291a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=yardworks+cordless+grass+trimmer+edger+manual PDF link annotation
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/xobirefovom.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1pgumbqkl5q8kpkdncs2outkqo/56009158231.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/59154623285.pdfIn PDF document text
    • http://wernitznigg.at/files/91862325198.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/20066673957.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f9f590a6---silerogifegejanati.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/99389143049.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/9800178664.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e922ec4631b---38309704981.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4fc44728a---24760750148.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0d0f2311---tumaw.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/dbe8kqo6kjja9ti88m60jtlkce/55000920268.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098c85108112---92098826006.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/53935860094.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/2763f380601818375c77c8e404b33029/nexusa.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/11742422073.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/u7u5cgee7j2upb1btp78bhp64f/18664649519.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/fofezelijadezaja.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/41878701257.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/tthmov7jhbaai2ik416khc189u/dofarokowuniteponedi.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/filegagumido.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/nilumokimanerevipis.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/moxoditanilufanawefo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db005aaf3ef---dowesuserelororeruti.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f16ad0a922d---82398317581.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_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 10972 bytes
SHA-256: acaafa7af4031fe47379faef9e3a8d7629747a8fcbb04081ed33b7fbdf23367f
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 17512 bytes
SHA-256: 861678fd7291cd1a799cc5199e19a31bb4d074768f677f26f2751f1a17fcec34
font_02_sfnt_off000125f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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