Malicious PDF — malware analysis report

Static analysis result for SHA-256 42117c010844f5cd…

MALICIOUS

PDF

90.1 KB Created: 2021-09-13 21:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4027257af48c9ec085f3a19ad594409b SHA-1: 7563dd4014221a4896edb1788e4ff7a099b00221 SHA-256: 42117c010844f5cd7a8e1bb72c1940c914ba8268d1450c2224cb65c6848f5b5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=live+chat+app+apk PDF link annotation
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/fujosolizijonufoxijupibip.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nedekinasezabe.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090917041311.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090412205972.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/84110884828.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/gusutavamoberi.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/75474268925.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/74648459342.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/26c256kccvkvin26jtqv65slb4/91338279487.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/51832258481.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/61408568250.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da076c67f0---dutunamiwimirupet.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/nadebasetefopid.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/11965840687.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/9380949376.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/45302845022.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/rovetufepoferugor.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/zobigukovepurobogubiperu.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/46335445675.pdfIn PDF document text
    • http://iscelenie.info/files/file/guxoxorefiju.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/99446614266.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4e9ba9e1a063568b2c0dbb64feeebddf/dexelizedilunubez.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161394d825b556---samokadaxijazawupojigu.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/91881cb97b536fb24c8e069fcc07a025/39469579627.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/68628248218.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_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 10048 bytes
SHA-256: c2479942fe891193a8788eb5bc5babbe1a64ae180b646cb09f3c2a49f7077c95
font_02_sfnt_off00012779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12779 19688 bytes
SHA-256: 2b79fbb3bb6b292284642a193496b30a744a7eb5de63e3d8ca67c6d00eda452e

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