Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1337e0ca69ddde…

MALICIOUS

PDF

102.0 KB Created: 2021-07-19 14:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7cd80fc43fe8681873d35b2717ac3287 SHA-1: 12fb808ee6302bca0d895169a791f80735f9caa6 SHA-256: 8f1337e0ca69ddde9da6fa46e18dac0114dab537044f6e94757daa4591bb8d2c
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://berallebags.com/UploadFiles/FCKeditor/20210615013622.pdf In PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/cjp5p3pqlhr0h5glf0k3ruenc2/43322690949.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1517acf5f---31197105199.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4e3420ca4d52d3ade8ad0caf749ce484/27737706536.pdfIn PDF document text
    • http://renovator.cz/files/file/10417173166.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad002462a92---teseruxasaz.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/79837421649.pdfIn PDF document text
    • https://cristalensi.com/public/File/40253638276.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f654fc805a---87840671155.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/72008159909.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/sivodiger.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c1c45f015---55396993012.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/84194550289.pdfIn PDF document text
    • http://sebatmakina.com/files/gumejujirug.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/104de127ebc258a92c90903821907ffe/juduxebut.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079803729ce0---kodagadoninakepiduwen.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607900b065197---sesizafomavedimu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5e3a5d007b428e992c2122180c5def79/63669248535.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/20e9ce5436dde2381d479cc0fd4cef04/70652876941.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/2381008309.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/71939402013.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/39m5fi7fiug20b3ic5t5k5ps98/wowep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=7+inch+pounds+to+foot+poundsPDF 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_off00012ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA8 17856 bytes
SHA-256: 84847456b612ead0ce8d6a6769895f4b51792bac0f38f336dcdf535e3d096c14
font_01_sfnt_off00015bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000173cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173CC 10332 bytes
SHA-256: ebe1dd870ca02514ca0ffaed76d38f58bfb7ebd57b0fc685f7cbf162e446fa94

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