Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d64cc7864a36a30…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 11:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09f3edcf5258038311f5165fbfe39d62 SHA-1: 56b55e91c560b10f039d0a8f1ffd14095637adbc SHA-256: 7d64cc7864a36a3050bf1baf776c7172ceef6b9ee2588ae7d2be19876d3773e9
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute further malware or phishing content. The PDF structure itself, combined with the numerous external links, suggests an attempt to lure users to malicious sites, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/emeulmaof2vl2da8396emi0p9g/wezexuronupamir.pdf In PDF document text
    • http://siciny.pl/userfiles/file/pafim.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/zanirabu.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/zanajol.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d09c50040cd9fd5b21c18d7c3a3a77ba/nogixafepe.pdfIn PDF document text
    • https://schmitz.cz/res/file/totitikedenigibenasojik.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/02eb51acf6f82cd330ec94035091a8ab/gatojifakegikofolitomej.pdfIn PDF document text
    • http://altus.pl/userfiles/file/nawopovanujexut.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/ferajetefi.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/64155126394.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4cbc63a691b6767bb0ccf2d7d058bf47/wuvelumo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818794bde9e---xomobazuvazogibogudi.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/jidapaveda.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe8132dde1---tuboxukedeletibuguw.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/q321os7tlsc4mi1d41tnd0mbc2/19421991501.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/98247129638.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3fc5f93edc6b04c5383ff54221d882fb/zovuputafolobagexu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759a4bc84f5---19825178486.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1e9e67ef---11355034311.pdfIn PDF document text
    • http://htygroup.com/upload/files/bavowixusigibugumawis.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/75727360214.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/25422542581.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/89ea31268b459b5bb64cccae13d9e071/xifoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pax+britannica+pdfPDF 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_off0000e272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 10392 bytes
SHA-256: b132bbfe87448462f4ff5e0400880800956383e1eee62c3e619f608a5ed00943
font_02_sfnt_off000111f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F0 18684 bytes
SHA-256: 7fa86e6cadce3d06fdaf4c87f33c74930ffb1ea6f096e8f1f73c7e943e3427f2

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