Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb380f7e29660444…

MALICIOUS

PDF

89.7 KB Created: 2021-07-25 15:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4bfe314e8f2b6f9221dd8f6aa96c9878 SHA-1: a8cefa9d7e3a454d672a7927140a1aa69447b6aa SHA-256: cb380f7e2966044431223727b9dc2a623c9c730f36fc5cd61e758aef1a0afbf8
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://merydian.pl/nowymerydian/userfiles/file/24807951290.pdf In PDF document text
    • https://t2sc.me/userfiles/numapoxibe.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/56282279110.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/c2442422e77ab12e6ac6c819f9ec3401/jegigigivobojit.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e39d6ca081---lafigikowizetem.pdfIn PDF document text
    • http://bio86.fr/fichiers/vufirirunoralizenawojele.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/9nv02o4pahihlq93kh1c1pbnsj/zirusas.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/891153277284a36b767f980242f906de/fagogupukamenizofe.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607752824f16b---59660048494.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/13183742013.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///94067202634.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/witefepa.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/2793c7pi6t2agjl8mgqirnqqfh/45865929209.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/vajuzumufafojoravi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1508e6be7---85414803162.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/57870982102.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/56109864900.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/kaxufubexanabumegis.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/35816233390.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/ravasakifolutanumerurema.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/55562845549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+hard+reset+iphone+with+computerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 16804 bytes
SHA-256: 478828748736c42b84efe95c9f5ba05f4e624e0acbb26c573a1c4f527fc1d21c
font_01_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13629 10912 bytes
SHA-256: ec24efa15b04772551f95243801caa2bc271cef74409287fcf31e4e4be1edf80
font_03_sfnt_off00014f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3C 1968 bytes
SHA-256: c7e7d125e82ceae927dd20a3878939955b4934ad90e0cfe7997f0c24e50dabaa

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