Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d075e48a55bac8…

MALICIOUS

PDF

94.9 KB Created: 2021-06-29 12:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 41544479d926cd507382b3847d9c8b2e SHA-1: 04c98dbfceedfdfb320fe9714ee791bd414702d8 SHA-256: c2d075e48a55bac857ebf1f53f35f719951626eed80cb6b21262a403d14b1d51
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress uploads, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://clickkedai.com/userfiles/file/xitatusurojul.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57b9ef1e2---mepujadusobu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b32e7aee7---zemeloxanipupotitid.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/84056786012.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fntrjlhk8b0d2obhf7gsuaans3/fiwitapusamewudisiju.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c879c87c9be---tomatibijo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/sv6sr5pqcnmr7c8oc4a1f1rd98/81343890764.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/bdb083df6956eaedb59f31b616965e99/29142844152.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/sutovodo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e6bd3332266fd27b15f121f3ee79b7c4/kewakibuwamifakerutemave.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d570e1aa1c4f8ca5298ac537189b66b3/volevimufu.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/80899944403.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a31f1b258c1---kulovukabalowa.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac0aa32a2a---63888532724.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/91be3395ac0037adbef8dc5b871dbbaa/62052546136.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/parikukekomuzumil.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/69fae417a9de8e492102b8d9a3d9deb1/96564539845.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/37619058309.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9a1a86144ce8eb714bef5dd53b7bc9f0/61438877578.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/fikobigufijatozepakos.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/00120e017ff3059b9ee858531162a2a1/1455553982.pdfIn PDF document text
    • http://minerva-collection.net/files/files/18058522893.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68079a6387---68679024647.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/sowukofemegotake.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/56446721838.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d16b97b0a---61057652592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=nucleus+in+the+animal+cellPDF 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_off00011373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 10352 bytes
SHA-256: cc7ad2583e5bbc684493934c4cbdfefbb6e98b61d95acaa2d6c009f7adbf252d
font_01_sfnt_off00012a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9B 16896 bytes
SHA-256: 2f45186c602ffbbfc8d93d1688cf5602ae798b0418a977c68b61ef28d022c027
font_02_sfnt_off0001564e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1