Malicious PDF — malware analysis report

Static analysis result for SHA-256 33212c988e354f51…

MALICIOUS

PDF

112.0 KB Created: 2021-07-04 12:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 314fadfa4cf5c9168b75e5984513848f SHA-1: dffc2197465d50a37fd2c54e1f3e6ac463eb8931 SHA-256: 33212c988e354f5173ca8860f96ab6cb5c5c88620dabaa4cf8ca52c4c45f5bf9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. These links likely lead to phishing pages or further malware downloads, serving as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eltonltd.ru/sites/default/files/uploads/65402341991.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/90801bab512f2f86fcddcef66d4e0cf2/pemajoke.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/c2c39908ad4a0b6a1204773553a1effb/rametugub.pdfIn PDF document text
    • http://russia-ex.com/tekulekemodulijaxawix.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/nadir.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce263b3a5d---45423422580.pdfIn PDF document text
    • https://arerp.kr/data/file///rafodagizopetab.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/0dfvluh62ppeopucndlfem2g12/fipor.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c34fb2854a785c798df5e4979ab9bda6/zagaxerapebimipun.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/56728737978.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/zokipe.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-12/20210512053051760064.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a4092f43f04b989fb62566ba712fce4a/71511420509.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/56330742474.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/jatediputuz.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/4a6b87b342dc7cbabf0d710c7ef94f95/sajilujelotep.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/99621420870.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/5ce263904084befb27a9b20cabddc781/44200856148.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d3ee45906---87014053558.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/52fd6692e1d9b7357e70420f8e8ca0d9/27591567676.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607c157ae93a6---rusijiwalalibopusunonaj.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/75832663207.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/24a88e078c00a809d8a35fb83e8e5fed/10616587943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=supple+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012dc8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12DC8 20632 bytes
SHA-256: 642d2e3a325823056c7fd0d504579f9e0e59e154d2e7f39505ba609e29164629
font_00_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 6156 bytes
SHA-256: 12ae10e5d3a87c301cc73c110d471662a7160f463f55a713f863ac610acab0b8
font_01_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15288 10228 bytes
SHA-256: ba56a3620c5df198f0e576a17ff1974b1bb8dd2413e01871251d419632eeaecf
font_04_sfnt_off00016950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16950 30372 bytes
SHA-256: c41eca9d69abfcfa6d0a631a4718e450e31a334ff29daa1bada3fd9ecea9f391

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