Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e1ff3767f6f6ca…

MALICIOUS

PDF

96.4 KB Created: 2021-07-02 23:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8cb6e490af2019232f35459aee61ec3c SHA-1: 8e035fa6ee6b52a0d8c1b4a6ab1b1ae73c2c0328 SHA-256: 55e1ff3767f6f6ca4ba68fb2450932285e7c910e0f202d050cb3d5a3ca56ccfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites. This suggests a link farm intended to manipulate search engine rankings or direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/a5q2l10k131jj72cmk5mc9gk6d/vefetibaraliferorof.pdf In PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/183f9cfd60c5b3a393182ae3708d3ec4/49942411471.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/19540369569.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/pixanizalegulidone.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/felerodujogogewapofumajur.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6fcffc3da18453bade0c6f9c8787db00/sakilowojudizi.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f73d2dfe---42210113119.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/michcuplqjjtlructq1s1q74l9/90825635579.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4206ca10aa9e155ed603e7f296967b9d/28763398177.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a41f1535---54286547034.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adb97856e26---3584865837.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/29161782519.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5fe6844ee---bivojepuxogonowetimojelig.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ee09b2e1---vomenewiderepapogorejed.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c62f384c9---jonevuroxusovamofawezenog.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5a6ab590---58993638114.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/gikidusogapepav.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/29381358877.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/gnrlfjghrpe1cqdtffsbqvv03m/kowoxarexadese.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3537c408a65fc99f21fa4bbf5d60859f/63919513913.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48f0402e7---28795946200.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/c8ec0c875653f0120ba0d0a5dcb94f1d/jejafazutuboreveb.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb079de98d2---202474832.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/36908971667.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/892bca32761b9715fc5692a7cd60737d/kibogivuzikixalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+do+dividends+work+in+stocksPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 18332 bytes
SHA-256: 15790e3f2251577b2488dbb7efedacf093d5e4a9a47f97bef9611de3f63ca70e
font_01_sfnt_off00011678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 17280 bytes
SHA-256: 0dcb36e6a3105826635d0d6d6e0d7082cf512dffb449fba3cee134103e49f3b2
font_02_sfnt_off000143b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B9 10388 bytes
SHA-256: ac937b0f2dd8fd49a6b696661ace237058a7eb1ec49ac9eccade907e8a2970c2
font_03_sfnt_off00015b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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