Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6be163c51007484…

MALICIOUS

PDF

90.0 KB Created: 2021-07-03 04:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f9742419db3b6ad83fde92cfaa95b5c0 SHA-1: 0623f362e270332d92c369fddbb11fb790e6e24d SHA-256: e6be163c5100748482b78931c113f70cb23f0c77670ad0a3e0e8a98a4d3086c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the nature of the link farm suggest it is used for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=yin+yoga+for+back+and+hips PDF link annotation
    • http://straub-online.ch/userfiles/files/6296430984.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/dbf88a8eeec4e0fde81396f36defcc3e/filazixafomowoverenufo.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/5942149751.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2f5f9cbb3c2326d3904eeb1528cdcc5c/12736120255.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608493ce29963---75164653717.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd8ca195e6a70866157f3262bfd8ded3/zidewotetunikexukug.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8502c918b3---sozodixowabewetusazu.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/47677877838.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e791c58096---fagugowawikawemalasepador.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/58293404411.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/76239687849.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/78126510785.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/dpl19j3pv2tfuqlq32ri5pdl65/migafuwo.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/joruji.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/76733133988.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/kimabufunepunu.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/jafepukaxilam.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/rixozopobazemekododab.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd16e1f78---temokuwuge.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/96577874159.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/4bdfabbqm3fkm409le1akj2sm0/36158243537.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f0a6f840---51565634577.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7632c07089---2530709024.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847f70aee60---falidokesimoxaseb.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b228ddd9fd3224de35dd6758dc0dfbdb/leverozunetefakov.pdfIn PDF document text
    • 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_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 10952 bytes
SHA-256: f56458d7502b5404b4bdcbd25ced40628b271ec09e1331fac3ec9920418b6990
font_02_sfnt_off00012e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2D 17132 bytes
SHA-256: ba1725888240b3f081666f6920d3a55d2a078ab1a1b2ee3c2e4f6ecc17871e36