Malicious PDF — malware analysis report

Static analysis result for SHA-256 393339e720dd59cd…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 09:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6df11d6478aa05fada098d9e3a7223cd SHA-1: 93413a1e61db8171af0e77b3e884b69d0b1e9d7e SHA-256: 393339e720dd59cd346a5c4696f9883ec3862ddf041379f9e7ee6b54a2414754
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67a55db044---2724591481.pdf In PDF document text
    • https://clubsecurite.fr/webroot/upload/files/lekiv.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/gusedakifumavopu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf2dc3f53f---298056075.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/bagoradovunapefotusupif.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/dcffmuui5ddlgki4jbnih38tob/xeluraxuviwe.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/fudurarurozanewaki.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kawoz.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/18295895612.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///tixim.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/furesawuvam.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92f6e863d7---4084555637.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/75023937943.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/70856723213.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d95549719---dutulirebepekusoxuxivez.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/83693143605.pdfIn PDF document text
    • https://phuquiland.com/upload/files/pazududiba.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/90883493660.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/49104223494.pdfIn PDF document text
    • http://serting.eu/userfiles/files/9126547071.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/gejoridetorafi.pdfIn PDF document text
    • http://nfc.soo.jp/file/jodoxipasuvowebe.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160742a035fe3c---95832568711.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/8415e9c562585656a5647d950f46d758/78540703442.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7gfj8fr0pej4jf297sgvul6st1/60771282928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=historicismo+arquitectura+pdfPDF 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_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 10868 bytes
SHA-256: 09d09d90468d0a535282b57137c2dd74d9022a56bbb574d21938b04861bcaaed
font_01_sfnt_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 18648 bytes
SHA-256: 97eb2613e884c046e057cb51d0987bb83173ed847bdad6147cd15f701aa134b1
font_02_sfnt_off000116f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1