Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcec692491e469f1…

MALICIOUS

PDF

94.8 KB Created: 2021-07-25 08:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0148a1e272e753c8fa2addea55da245c SHA-1: 3fa8835960408fe2878d0d43746b48fca31ddea8 SHA-256: bcec692491e469f1ff0df845e8ee84ea8f880e97f088badacf7d0388e3701094
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to numerous external URLs, some of which are hosted on compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. The presence of a visual download button lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://sahamit.net/userfiles/file/67534492757.pdf In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e3d1ba09b---widuzotuz.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/bevatipos.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d6c91f23609d155c4d4a80409c64c5e8/dupomalabozag.pdfIn PDF document text
    • http://espokebar.com/uploads/files/bugelorepexixavifurukigaz.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16258662111786314576.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd28734a026---gegobiboxurowirazeworema.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/63868576834.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/gijaditawuroza.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8b455622---xepikivavivanise.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/xiwonununakisosasefodogum.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/79243915211.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/cdc6bf982eea29edd154b92cef9cebba/35578945477.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/zuvekalalimije.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/7375a57f6ced721864e5e1970a26ed44/dibifuzojinid.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adee72a37aa---4569889398.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f74de105fee---80405302327.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ca5o8agt1epec4guanmksoo9l4/migupagetiwubowizov.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160de10e772c3d---88062476728.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d324bdcbc0e---10500516419.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/61232670325.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7b68e08e1---togezatataxuri.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210602054626183.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/81998221756.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/49739189102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dls+2020+mod+apk+obb+data+offlinePDF 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_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00012536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12536 11032 bytes
SHA-256: 95683d7a481bc927a22489626d8ca426f8ecfc74f55acfef48e453b0d1b4d1f3
font_03_sfnt_off00013ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA4 17484 bytes
SHA-256: 40f24c522dd43f5b4b12f7bca6030a75ab1432a4dbd108f120a1e3ef5611f4d8

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