Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdce4322dee90d3…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 22:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d03a90365f37cf431ff186f8c5ff8e00 SHA-1: 0fc5fb39699228c898a7a0380344489fd94d96a9 SHA-256: 7bdce4322dee90d3cc19462157a12e328ae401d442adc1eae93d1d1f646fd9a3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters indicate a coordinated effort for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://clickkedai.com/userfiles/file/bixuvaxekofew.pdf In PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077544f261fa---vonevokamefozemubofusi.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/a89172f96d43d3156b2ff788146e2c95/86597197990.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/dfce9ccdb3bbe749faafed536d0f93d1/zidelevarozaxudetofe.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/takasatituvujiwinisotasad.pdfIn PDF document text
    • http://fittbikese.hu/files/file/13889920131.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/bowixi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecc4ac18b7---kowejetiworaseja.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e59a39b02---fomibetuvuvizesit.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/31033373006.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/miret.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16216144337516.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/48212516879.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1b125f754---widil.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/d4ef3d51b122a02ce7287c9cc0c8428d/3381610388.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/r924r9q7hb6bhq12m4r6otku64/sujexud.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/91927485119.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b8e181532052b106259d60187887b682/limaved.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1544aa0c33---ridegibebawoxufinaf.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/xevibibuzisonefikuwu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86afe62347---12726539641.pdfIn PDF document text
    • https://isleo.com/i_photos/file/81475170215.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/75223433717.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/54594806435.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/83707388111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=my+lavender+is+wiltingPDF 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_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 17340 bytes
SHA-256: 3b8aca355321e927032612207d3f53eb1a5359e465fc2edb606d2bb4a8d6b956
font_01_sfnt_off000113f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 10564 bytes
SHA-256: 2abd140353e4dfda32c9317306e5ba7939da8754574785d20070948a96454a00
font_02_sfnt_off00012c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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