Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ff601179ca7504…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 18:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: af34bbfd50bb4a26994c812b0699c103 SHA-1: 238df51a659a6cae2044eddf3b090f56ebeeb6ca SHA-256: 19ff601179ca7504e027e7375a84e001b028954390b5d2c66a852ea2908a7a0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS upload directories, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135163fb3f15---71931454617.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130853be135f---77669986.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/pupedo.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ftjq45psn467sunm5v1d915rvg/54353663713.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161381a02503d2---wofeguwetutuwikemi.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/49122903107.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/66669934197.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/suferinevolif.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/22663685505.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/39129862041.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/72733146125.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3455d737f---jivonolu.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/17862613124.pdfIn PDF document text
    • https://satesayap.com/contents/files/75222018308.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/dewufa.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/37735246760.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/demajesije.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/18273114266139c053c79ef.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/18464834566.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/73094497378.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/16494743242.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/gowuvowaz.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/on251tn3bem8rbtv5fvpapdq3l/lolixugosetutupite.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gq2vgk66upmsghqtg51dke7m8b/11504533249.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/41886650967.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/dubofesewavenaripe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=speed+post+india+international+trackingPDF 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_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 18808 bytes
SHA-256: e01b9258a92096605262aaec6e363beb16b9ce85796e67d6dca7d7558efa2eb1
font_02_sfnt_off00012308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12308 10856 bytes
SHA-256: d8e6f4a9382fc191f9969a23b0546be32853b3598a68b8c5473cb4a60d10e042