Malicious PDF — malware analysis report

Static analysis result for SHA-256 71099a36ea05ac4f…

MALICIOUS

PDF

95.8 KB Created: 2021-07-04 22:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 27aa52ce001f3f0a3fc5e91d7e0ec2dd SHA-1: c61bee1d4f0cb664a407f6bea71a1fb876120a24 SHA-256: 71099a36ea05ac4ff0e01095350b89f91ceac4191be34121cac4eba5316b0a15
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other potentially malicious PDFs, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, indicating the PDF's purpose is to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://lysgaards.com/ckfinder/userfiles/files/43137675872.pdf In PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/1tfb5si7su085qv031dj4tbepp/81967737864.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2aba7e735d2ead79919baa7f2fa4d427/38982132386.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983b4ba304c---76018065528.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14976277e---fagifozujoxus.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a3521c6a6ad---pozajarenubeg.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/39498975804.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/97147988740.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/6369621604.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/pirizarude.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3062cc3b51---50275968192.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/65652889674.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38545998d---59955699294.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875872d24a6---felosofuwe.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///99252430455.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/7pnss53jtnct9ffctk4fbbiuc3/16596151080.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ats603dt7b41uf6ken7ikp3dev/dedizudumos.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/msr97fd4gv7849ug1k1o135nbh/dumavakumuduzadola.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/fusuwimewexararolet.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160781fd01c713---72266638015.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/4d3312ab0516fe14f45f4d016543e844/78708554636.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/en5786rbc3j4i2aavhnbnsb1b9/lexurag.pdfIn PDF document text
    • https://raljob.com/userfiles/file/83621914982.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f8fcab9ced46de7dfa0099e298795e78/80000683036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=give+access+to+shared+calendar+office+365PDF 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_off0001118b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118B 11152 bytes
SHA-256: 06db5b4eb09248c8f561f82bf20f9889589622a0d33987e63a2484c67019c5e3
font_01_sfnt_off00012ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BA 16904 bytes
SHA-256: f9497796d6c6e5e6e31b6cc67d1bb39e440cdaae5d9b6baa12aa8586cdeb8d56

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