Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2908b50c82ac52…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 05:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d135e82af18a002ef2c809786de0b431 SHA-1: ce6ab6f590c215c7b733f2b3246305812740679e SHA-256: de2908b50c82ac529a2f63fcfe1c5cb290a9abf69d32136ebb41326e88f70bbf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains flagged as link farms or hosted on potentially compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://jamalcar.com/userfiles/file/muzazamirodememev.pdf In PDF document text
    • http://islenapuntos.com/campannas/file/90316873987.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/buwerumojekuta.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134d84da1dbc---sebibomabapix.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/07945eeb77e653ae0d6ca2af63ba393a/xabet.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/13786499050.pdfIn PDF document text
    • http://castel.lu/userfiles/files/96943765642.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/jukenogox.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/34579004700.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/zadekorobojisusapudiw.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/vinivawutuj.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210909224753.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecfea7e88b---48906177481.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/31365304306.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/3933661190.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/kebusubupijuruginom.pdfIn PDF document text
    • http://hoachattn.com/image/files/mibojanikun.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/norunubelejaxinubaw.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614334ea20668---mewogi.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/videfa.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/96656724359.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/magogefasutejisof.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0ba17ab0---58063981075.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/99246424002.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/cfdea979e51cba14672c527b45e630d6/57245805368.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/31846171432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+fix+a+frozen+android+phonePDF 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_off0000b560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB560 14384 bytes
SHA-256: 39bb5b3f77ddfcc10a9824d7d22017b8def71f57da81f27cc71593a0da4fd854
font_01_sfnt_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 10620 bytes
SHA-256: 86ba118e70c3c4e1ad011440ef80fa9170c5abcf00194a4bcd7b19e3782d26ea

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