Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a0b6d80ea85a7c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 13:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 71c1761fe050c2e1fae822eb63f728ed SHA-1: 5857801bbcd341a589b54b911eab591576bc4170 SHA-256: 43a0b6d80ea85a7c141480849767199ed1d1c17b14879bab5551a95f93c6b6be
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/27835435654.pdf In PDF document text
    • http://ventexevent.se/uploads/file/taliwidudavatud.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/21784074194.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/4151803591.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/petoribodope.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/wavigexutabusolaxolavexos.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/fa5b0990a37829350b0d5299811b6b86/12939444592.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/22481163416.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/40347936983.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/zuwomomatuv.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/90162244931.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/mutafiworobawax.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/retelebeve.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613352e701427---xidijamavunabanu.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/18727444694.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/40454185316.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/16558589099.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/dotemovesuzuxukigogibivul.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca92f43ca8---28434211833.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3c87c9137---masimapesasemapetus.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/11064298913.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/mumuzolusesiloge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=price+of+ipad+air+3+in+pakistanPDF 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_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 10832 bytes
SHA-256: 13ba47baaee95f312b47b1f862bdebc129392b132c87e207779022239fc99718
font_01_sfnt_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 17652 bytes
SHA-256: 610ceb1184be3aa5f4af3e0f9e3508ef689df6b1bdbbe8c661be54de54d9542f

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