Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c267f4b6ca9681…

MALICIOUS

PDF

71.3 KB Created: 2021-09-03 06:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d21a50f3f302761954e5cd1991c3c4ee SHA-1: 23b62e7eee85e7f8d7f5b11a12f8b6abf210c6cc SHA-256: b5c267f4b6ca96812d43f7a5dc98436c354c9ce3bf874ff60b95c15dc2238d61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised CMS upload storage and acting as a link farm, suggesting a phishing or malware distribution lure. The presence of embedded JavaScript, though not fully detailed here, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=surah+maryam+bangla+pdf PDF link annotation
    • http://heizler.hu/files/file/rozafoziboguvogugon.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4cae88717a---sowibamusuxapejamelilanes.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ade7e6088ff---82391360005.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/75167611182.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/juxatuto.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/37269264617.pdfIn PDF document text
    • http://www.toptehnik.si/images/77909322046.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c267193183f---nawimebetanek.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/bumevibigosumor.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/l4r94nn50r5qie78kerluoepoq/22494615277.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/75861204636.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/fef4be6ba8f06c2b55bd3f487baa9ca0/45409860511.pdfIn PDF document text
    • http://www.hcc-cpas.com/siteuploads/editorimg/file/nukekebefij.pdfIn PDF document text
    • http://goref.ru/files/file/vevarakuzeretinasekana.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0c6b4e8365e87a0fa9d994b8f8ad014a/90124745984.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/vimiposuroxifanofemoxem.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4668b9279---25414444397.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/34668104463.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d084c2b79---9464090666.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131418167720---13301047007.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/7262037831.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/82829679571.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7007128914e94a2f10b63e6382eeb2f9/tolesonovataxe.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/zugufodirefenosevuxazaked.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_off0000b64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64B 10764 bytes
SHA-256: c58549bc0131bb2e3776f54e2c9f341c6ff571fdbbcaf831aa2e49a8b2950048
font_01_sfnt_off0000ce6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 15904 bytes
SHA-256: 5a3a2f66a74f626c3d7e9fe5bd77777054e9aa9024d86bf23d28dd2393f1316b

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