Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c7d104d027c6c6…

MALICIOUS

PDF

74.1 KB Created: 2021-08-21 13:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c0682f3350bb4445d91824b76561811 SHA-1: 535853dc16ccb6b3d1745bd7ccce7fc024bd5569 SHA-256: 71c7d104d027c6c6e59c610d64e3e3f370a5f7394b5f8f1c92ecf0e3d603cbdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites, suggesting a link farm or phishing lure. The presence of a URL related to 'smartwatch gt08 firmware download' indicates a potential social engineering tactic to trick users into downloading the malicious PDF. No scripts were extracted, but the PDF structure and URL patterns are indicative of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ec6b31b923ce50d94ac833a16976a32/74322007291.pdf In PDF document text
    • http://logistra.fr/ressource/site-image/files/banajividajubi.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/dibobefaxalezaluvo.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/94217483038.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/nijupowemem.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3780e503f---33441592171.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5185602e2dc65a1f8aebda55db7ccf13/5285889761.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/59399094783.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/2583115165.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a50dd09be045f4c22145263b0d319ec1/xerofoderewatoja.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7882b93e796b6a669c57d0f69dec2b17/94931358105.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/ruxadimotepiju.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/zuzavoregitufav.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafefe9c0c6---70478726616.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41dbe2c366---xuwukowejug.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160839112269ac---kesipovuvowimerozepew.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3800a55f---80777454988.pdfIn PDF document text
    • https://baglab.pl/galeria/file/miwovamuxivopezawawupex.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5761bbaf86445d29411da596852b8954/21867946935.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/zorutebojugizobavokofi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf8ed84ad3---38822521205.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/s23nue574jpo198s48b1i9fvb7/69694136826.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765c9448dcc---44250767785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=smartwatch+gt08+firmware+downloadPDF 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_off0000bed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED9 15808 bytes
SHA-256: 1966c7aa4cae161c706aaf0fef5cb8dfc0eb124552157a4f30c020ee59b25d3e
font_01_sfnt_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 11248 bytes
SHA-256: d3e167c4a38dd5fbdc19432fa626b0504ef2326f636ed6ffe67bffc617e1ae26
font_02_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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